{"id":60,"date":"2026-04-08T07:01:56","date_gmt":"2026-04-08T07:01:56","guid":{"rendered":"https:\/\/www.fukabori.soretodesign.com\/en\/?p=60"},"modified":"2026-04-14T07:30:12","modified_gmt":"2026-04-14T07:30:12","slug":"shima-zushi-izu-islands","status":"publish","type":"post","link":"https:\/\/www.fukabori.soretodesign.com\/en\/syokubutsu-kurashi\/shima-zushi-izu-islands","title":{"rendered":"The Journey of Shima-zushi: How Sea Breezes and Chili Peppers Shaped the Izu Islands\u2019 Signature Preserve"},"content":{"rendered":"\n
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Plants & Living<\/a>, <\/span>Soil & Plants<\/a><\/div><\/div>\n\n\n\n
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\u65e5\u672c\u8a9e\u7248<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n
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Today, I want to delve into the story of Shima-zushi<\/strong> (Island Sushi).<\/p>\n\n\n\n

Why this particular dish? Simply because I love the experience of it\u2014tasting those bold flavors while gazing out at the vast ocean. Although, I must admit, it\u2019s been quite a while since I last sat by the shore with a tray of sushi in hand…<\/p>\n\n\n\n

When you lift a piece of Izu Island sushi to your lips, the sensation is different from what you might expect. Instead of the sharp, watery freshness of wasabi, you are met with the deep, grounding heat of karashi<\/strong> (Japanese mustard). Then there are the slices of fish themselves: they aren’t pale or translucent, but a lustrous, translucent amber. They have been bathed in a soy sauce infused with Shima-togarashi<\/strong>\u2014small, fiery island chili peppers. (Seeing them shimmer in the light is enough to make anyone\u2019s mouth water!)<\/p>\n\n\n\n

But this style wasn’t chosen for aesthetics alone. It makes one wonder: in a place surrounded by the sea, how did this specific tradition of soy-marinated fish and chili come to be?<\/p>\n\n\n\n

Why Shima-togarashi and Soy Sauce? Why not Salt or Wasabi?<\/h2>\n\n\n\n

Salt: An Island Nation with No Salt Underfoot<\/strong><\/h3>\n\n\n\n

Japan is an archipelago surrounded entirely by the sea, yet the land itself holds no salt deposits deep within its soil. On the islands of the past, obtaining salt was a laborious cycle of boiling down vast amounts of seawater. This process “swallowed” incredible amounts of precious firewood\u2014making salt a resource far too valuable for everyday preservation.<\/p>\n\n\n\n

Within these environmental constraints, the islanders had to find another way to keep their fish from spoiling in the humid air. Their gaze turned toward shoyu<\/strong> (soy sauce) arriving from the mainland. This seasoned liquid became the essential vessel for preserving the ocean\u2019s bounty, giving the fish a longer life and a deeper soul.<\/p>\n\n\n\n

Chili Peppers: The Wild Spirit of Shima-togarashi<\/strong><\/h3>\n\n\n\n

To the bottles of soy sauce, the islanders added these small, whole chili peppers. As the days passed, the heat slowly dissolved into the liquid, transforming a simple preservative into a vibrant, all-purpose seasoning with a sharp, fiery kick.<\/p>\n\n\n\n

The Shima-togarashi<\/strong> (also known as the tree chili<\/em>) originally hailed from the tropical regions of Central and South America. After being introduced to Japan during the Edo period, it didn’t just stay in the gardens where people planted it. It began to “grow on its own,” weaving itself into the wild landscape of the islands for a few fascinating reasons:<\/p>\n\n\n\n

    \n
  • A Love for Humidity and Heat:<\/strong> The Izu Islands\u2019 warm, rainy climate felt just like home to these peppers.<\/li>\n\n\n\n
  • The “Tree” That Never Sleeps:<\/strong> In the colder parts of mainland Japan, chili plants are “annuals”\u2014they wither and die when winter arrives. But on these islands, the winters are gentle. The plants don’t die; instead, they grow woody and tall like small trees (giving them the name Kidachi<\/em>, or “standing tree”), bearing fruit for many years. Even without fertilizer, they grow vigorously along roadsides, in wastelands, and even near the salty spray of the coast.<\/li>\n\n\n\n
  • Wandering Seeds:<\/strong> Interestingly, birds cannot feel the “heat” of chili peppers. They eat the bright red fruits and carry the seeds far away, dropping them across the island.<\/li>\n<\/ul>\n\n\n\n

    Compared to the common Takanotsume<\/em> (Hawk\u2019s Claw) chilies found elsewhere in Japan, the Shima-togarashi also has some delightful quirks in how it looks and grows!<\/p>\n\n\n\n

    A Tale of Two Chilies: Shima-togarashi vs. Standard Chili<\/h4>\n\n\n\n

    While they may belong to the same family, these two peppers lead very different lives. Here is how the petite island chili stands apart from the common Takanotsume<\/em> (Hawk\u2019s Claw) found on the mainland.<\/p>\n\n\n\n

    Feature<\/th>Standard Chili (Takanotsume<\/em>)<\/th>Island Chili (Shima-togarashi<\/em>)<\/th><\/tr><\/thead>
    Size<\/strong><\/td>Long (approx. 5\u20137 cm)<\/td>Petite (approx. 2\u20133 cm)<\/td><\/tr>
    Shape<\/strong><\/td>Slender with a pointed tip<\/td>Small, rounded, and bead-like<\/td><\/tr>
    Growth Habit<\/strong><\/td>Downward:<\/strong> Hanging from the branches<\/td>Upward:<\/strong> Reaching toward the sky<\/td><\/tr>
    Life Cycle<\/strong><\/td>Annual:<\/strong> Withers in the winter<\/td>Perennial:<\/strong> Lives for years, becoming “woody”<\/td><\/tr>
    Heat Level<\/strong><\/td>A classic, bold kick<\/td>Sharp & Intense:<\/strong> 2 to 3 times hotter<\/td><\/tr>
    Aroma<\/strong><\/td>Familiar, savory, and sharp<\/td>Fruity:<\/strong> Distinctly rich and aromatic<\/td><\/tr>
    Main Uses<\/strong><\/td>Condiments, dried flakes, chili oil<\/td>Soy infusions<\/strong>, Island Sushi, Kore-gusu<\/em><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    It is this unique, spirited aroma that gives Shima-zushi its incredible depth. Without the chili, the dish simply wouldn’t be the same!<\/p>\n\n\n\n

    What\u2019s even more fascinating is that the flavor of the soy sauce changes depending on when<\/em> the chilies are harvested. You can enjoy two distinct personalities from the same plant:<\/p>\n\n\n\n

      \n
    • The Green Harvest (Unripe):<\/strong> When picked while still green, the infusion is defined by a crisp, “snappy” heat and a grassy freshness. In the Izu Islands, this version is often preferred for a style called Bekko<\/em><\/strong>\u2014where the fish takes on a beautiful, translucent tortoiseshell glow.<\/li>\n\n\n\n
    • The Red Harvest (Fully Ripe):<\/strong> As the chilies ripen to a brilliant red, they develop a natural sweetness and complexity. The soy sauce becomes mellow and deeply fruity, with a heat that feels rounded and warm.<\/li>\n<\/ul>\n\n\n\n

      Both sound absolutely delicious\u2014and let\u2019s be honest, they undoubtedly are!<\/p>\n\n\n\n

      The Canvas for the Flavor: Local Whitefish<\/h2>\n\n\n\n

      The “Island Style” is to use whatever the sea offers at the peak of its season\u2014specifically, firm yet fatty white-fleshed fish. Here are the stars that often find their way onto a Shima-zushi tray:<\/p>\n\n\n\n

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      1. Medai (Bluenose Warehou) \u2014 The King of Island Sushi<\/strong>\n
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        • The Profile:<\/strong> Known for its soft, buttery texture and rich fat content.<\/li>\n\n\n\n
        • The Pairing:<\/strong> The sweetness of the fat creates a perfect harmony with the spicy kick of the chili. It literally melts in your mouth, leaving a balanced, refined finish.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
        • Onagadai (Flame Snapper) \u2014 The Elegant Beauty<\/strong>\n
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          • The Profile:<\/strong> A stunning, bright red fish with a clean, sophisticated flavor.<\/li>\n\n\n\n
          • The Pairing:<\/strong> While delicate on its own, marinating it in island soy sauce adds a necessary “body” and depth to its light, elegant flesh.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
          • Shima-aji (Striped Jack) \u2014 The Island Treasure<\/strong>\n
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            • The Profile:<\/strong> Famous throughout the Izu Islands for its distinctive “snap” (texture) and intense, savory umami.<\/li>\n\n\n\n
            • The Pairing:<\/strong> The salt of the soy and the heat of the chili act as a spotlight, making the bold, natural flavors of the Shima-aji shine even brighter.<\/li>\n<\/ul>\n<\/li>\n\n\n\n
            • Kanpachi & Hiramasa (Amberjack & Yellowtail) \u2014 The Robust Pair<\/strong>\n
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              • The Profile:<\/strong> These fish have firm, meaty textures and a substantial amount of fat.<\/li>\n\n\n\n
              • The Pairing:<\/strong> The marination process mellows the strong “blue fish” aroma, transforming it into a smooth, easy-to-eat delicacy with a satisfying bite.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n

                A Few Seasonal Specialties…<\/h3>\n\n\n\n
                  \n
                • Aodai (Blue Snapper):<\/strong> A summer favorite, especially around Hachijo-jima. Its flesh is beautifully translucent and pairs flawlessly with the amber glow of the soy sauce.<\/li>\n\n\n\n
                • Tobiuo (Flying Fish):<\/strong> A sign of spring and summer. Though naturally lean, the marinade gives the flesh a wonderful, moist silkiness that is truly unique.<\/li>\n<\/ul>\n\n\n\n

                  Can You Use Both Chili Soy Sauce and Karashi?<\/h2>\n\n\n\n

                  Is it possible to enjoy both the heat of the island chili and the sting of Japanese mustard at the same time? The answer is a resounding yes<\/em>. In fact, the way Shima-zushi is served varies from island to island, home to home, and shop to shop. Here are the two main ways people embrace this “double heat”:<\/p>\n\n\n\n

                  1. The Layered Style: Marinated in Chili, Topped with Karashi<\/h3>\n\n\n\n
                    \n
                  • The Method:<\/strong> First, the fish is “Zuke” (marinated) in soy sauce that has been aging with Shima-togarashi. Then, as the sushi is pressed, a small dab of karashi<\/em> (Japanese mustard) is tucked secretly between the rice and the fish.<\/li>\n\n\n\n
                  • The Experience:<\/strong> The moment you take a bite, the fruity aroma and sharp, clean snap of the chili soy sauce spread across your palate. Just a second later, the deep, nasal sting of the mustard follows, “chasing” the first heat. For those who love a bit of fire, this is a luxurious, multi-dimensional experience.<\/li>\n<\/ul>\n\n\n\n

                    2. The “Extra Kick” Style: A Finishing Dip<\/h3>\n\n\n\n

                    This style is common on islands like Hachijo-jima, where karashi<\/em> is the standard condiment inside the sushi.<\/p>\n\n\n\n

                      \n
                    • The Experience:<\/strong> The sushi itself is the classic “Fish + Mustard + Rice” build. However, the small side dish of soy sauce provided for dipping is already infused with Shima-togarashi. By dipping your sushi into this seasoned sauce, you are effectively blending the two worlds of heat in every mouthful.<\/li>\n<\/ul>\n\n\n\n

                      A Harmony of Two Heats<\/h3>\n\n\n\n

                      You might wonder, “Do these two strong flavors fight each other?” Remarkably, they don’t. That\u2019s because they offer two entirely different types<\/em> of sensation:<\/p>\n\n\n\n

                        \n
                      • Karashi:<\/strong> A sharp, volatile sting that travels through the nose.<\/li>\n\n\n\n
                      • Shima-togarashi:<\/strong> A direct, piercing heat (capsaicin) that dances on the tongue.<\/li>\n<\/ul>\n\n\n\n

                        When these two meet, they don’t clash; instead, they work together to highlight the natural sweetness of fatty fish like Medai<\/em> or Shima-aji<\/em>. The result is a flavor that is incredibly bold, yet leaves your palate feeling surprisingly clean and refreshed. It is, quite simply, a masterpiece of balance!<\/p>\n\n\n\n

                        Side Note: A Touch of Sweetness in the Rice<\/h3>\n\n\n\n

                        If you taste Shima-zushi, you may notice that the sushi rice (shari<\/em>) is a bit sweeter than what you find in Tokyo. This is a reflection of the island’s warm climate and history. In the past, adding more sugar to the vinegar was a practical choice\u2014it provided a quick energy boost for physical labor and helped preserve the rice in the humid heat.<\/p>\n\n\n\n

                        This sweetness creates a rich, mellow foundation that perfectly offsets the fiery chili and the salt of the soy sauce. Interestingly, while the seasonings are local, the vinegar itself is typically standard rice or grain vinegar brought over from the mainland\u2014a small but important link to the world beyond the horizon.<\/p>\n\n\n\n

                        Closing Thoughts<\/h2>\n\n\n\n

                        Isn’t it fascinating how the simple act of “preserving fish” can vary so much from one island to the next? The next time you find yourself looking out at the Pacific, imagine the different flavors waiting for you on each shore. To help you plan your culinary journey, here is a quick guide to the two main styles of Shima-zushi.<\/p>\n\n\n\n

                        Comparing Shima-zushi Styles: Hachijo-jima vs. Oshima & Toshima<\/h3>\n\n\n\n
                        Feature<\/strong><\/td>Hachijo-jima Style (The Standard)<\/strong><\/td>Oshima & Toshima Style (Bekko)<\/strong><\/td><\/tr><\/thead>
                        Common Fish<\/strong><\/td>Medai, Shima-aji, Tobiuo, Onagadai<\/em><\/td>Medai, Budai<\/em> (Parrotfish), Isaki, Tai<\/em><\/td><\/tr>
                        Marinade<\/strong><\/td>A sweet and savory soy-based sauce<\/td>Soy sauce infused with Shima-togarashi<\/strong> (Spicy)<\/td><\/tr>
                        Condiment<\/strong><\/td>Karashi<\/strong> (Japanese Mustard) is the standard<\/td>Green Chili<\/strong> (Dissolved in soy or minced)<\/td><\/tr>
                        Appearance<\/strong><\/td>Deep amber, reminiscent of tortoiseshell<\/td>A glossy, golden glow from the chili oil<\/td><\/tr>
                        Rice (Shari)<\/strong><\/td>Often noticeably sweet<\/td>Standard sushi rice, or slightly sweet<\/td><\/tr>
                        History<\/strong><\/td>Mustard became the go-to substitute for wasabi<\/td>A “local-first” approach using garden-grown chilies<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"

                        Ever wondered why “Island Sushi” uses chili and mustard instead of wasabi? Discover how the history of the Izu Islands and the wild Shima-togarashi pepper created a unique culinary tradition. From the fiery yet fruity allure of island chilies to the best seasonal fish pairings, delve into a taste born from the wind and soil.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,5],"tags":[],"class_list":["post-60","post","type-post","status-publish","format-standard","hentry","category-syokubutsu-kurashi","category-dojyo-syokubutsu"],"yoast_head":"\nThe Journey of Shima-zushi: How Sea Breezes and Chili Peppers Shaped the Izu Islands\u2019 Signature Preserve - Deep dive trivia<\/title>\n<meta name=\"description\" content=\"Ever wondered why "Island Sushi" uses chili and mustard instead of wasabi? Discover how the history of the Izu Islands and the wild Shima-togarashi pepper created a unique culinary tradition. From the fiery yet fruity allure of island chilies to the best seasonal fish pairings, delve into a taste born from the wind and soil.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.fukabori.soretodesign.com\/en\/syokubutsu-kurashi\/shima-zushi-izu-islands\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Journey of Shima-zushi: How Sea Breezes and Chili Peppers Shaped the Izu Islands\u2019 Signature Preserve - Deep dive trivia\" \/>\n<meta property=\"og:description\" content=\"Ever wondered why "Island Sushi" uses chili and mustard instead of wasabi? 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