Mekabu-pan (めかぶパン) is a Japanese bread made by kneading mekabu — the frilly sporophyll at the base of the wakame seaweed plant — into the dough, often with a touch of soy sauce, sesame, or shio-koji for seasoning. The crumb develops dark green flecks and a faint marine umami similar to a savory rye. Mekabu adds soluble fiber and a slightly sticky texture that helps moisture retention, so the bread stays soft for an unusually long time. It is one of several Japanese 'seaweed bread' variants alongside wakame-pan, hijiki rolls, and nori-flecked baguettes.

Where does the seaweed come from?

Most commercial seaweed bread in Japan uses wakame and mekabu from the Sanriku coast — the long Pacific coastline of Iwate and Miyagi prefectures, where cold currents produce thick, flavorful kelp. After the 2011 Tohoku earthquake and tsunami damaged Sanriku seaweed farms, the regional fisheries cooperative actively marketed processed seaweed products — including mekabu paste, dried flakes, and frozen blocks designed for baking — to bakeries nationwide as part of long-term recovery.

Where in Tokyo can I actually find it?

Seaweed bread is a niche-of-niche category — most large chain bakeries do not carry it. Reliable hits are: small neighborhood bakeries in older downtown areas (Ningyocho, Tsukishima, Kagurazaka, Yanaka); the bakery counter inside a major depachika (department-store basement food hall), where the seasonal lineup rotates; and occasional limited-run items at antenna shops for Iwate and Miyagi prefectures, especially near Tokyo Station and Yurakucho. Tabelog and Google Maps listings flagged as 'mekabu pan' or 'wakame pan' are the most efficient way to find current stockists.

Today I Learned

Japan, apparently, has bakeries that bake bread with seaweed — mekabu kneaded into the dough like a savory rye

Mekabu-pan and other seaweed breads — wakame, hijiki, nori folded into the dough — are a niche Japanese bakery category, mostly using Sanriku-coast seaweed in small Tokyo neighborhood bakeries.

Published 2026-05-07 · 2 min read · By Daichi

◇ A round dark-green-flecked bread loaf cut in half on a wooden board, with visible strands of seaweed in the crumb and a small dish of butter beside it

Bread with strands of seaweed in the crumb

A small bakery near Ningyocho, Tokyo, opens at 7 a.m. with the usual lineup — milk bread, an pan, curry pan, croissants. Among them, slightly darker than the rest, are a few rolls and one round loaf flecked with green: mekabu-pan, bread baked with seaweed kneaded into the dough.

Cut into it and the crumb is the soft white of a Japanese shokupan, but with thin dark green strands and a faint aroma somewhere between sea air and soy sauce.

This is a real, if narrow, Japanese bakery category, and one of the more direct cases of Japanese coastal ingredients quietly migrating into Western-style bread.

The fact

Japanese seaweed bread is mostly a few related products:

Mekabu-pan — bread made with mekabu, the frilly sporophyll at the base of the wakame plant. Slight stickiness, soft crumb, savory.
Wakame-pan — bread with chopped wakame leaves; greener crumb, more pronounced seaweed flavor.
Hijiki rolls — small rolls with hijiki (a black seaweed) plus soy and sometimes lotus root; often served at school lunches in coastal regions.
Nori baguettes — French-style baguettes with crushed roasted nori folded into the dough.

The most common source for the seaweed is the Sanriku coast — the long Pacific coastline of Iwate and Miyagi prefectures — where cold-current kelp farming has been the regional industry for over a century. After the March 2011 Tohoku earthquake and tsunami devastated Sanriku seaweed farms, the regional fisheries cooperative (Sanriku Fan / Sanriku Seafood Promotion Council) and individual producers repositioned mekabu and wakame as value-added paste and dried-flake ingredients, marketed to bakeries, ramen shops, and restaurants nationwide. Seaweed bread benefited directly from that reframing.

Why it works this way

A few overlapping reasons:

Mekabu’s natural binding behavior. Mekabu contains soluble fibers (alginate, fucoidan) that hydrate the dough and slow staling. Bakers report mekabu-pan staying soft a full day longer than the same recipe without it. That is a real, practical reason to use the ingredient.
Mild flavor that does not overpower. Mekabu’s umami is gentler than nori or kombu. It pairs with butter and toasted sandwich fillings without dominating, which is why it crossed into Western-style bread rather than staying inside Japanese cuisine.
Tohoku recovery economics. After 2011, Sanriku producers needed new domestic demand. Bakeries — small, urban, willing to try regional ingredients — were a natural early adopter. Some neighborhood Tokyo bakeries now carry the mekabu loaf year-round as a regular item rather than a one-off.
Niche bakery culture in general. Japan has an unusually deep small-bakery scene, with neighborhood shops competing on novelty and seasonality. Adding a regional-ingredient loaf to the lineup is normal practice.

Where to find it

Small bakeries in old-town Tokyo — Ningyocho, Tsukishima, Kagurazaka, Yanaka are reliable hunting grounds. Look for handwritten signs reading めかぶパン or わかめパン.
Depachika bakery counters — Isetan Shinjuku, Mitsukoshi Nihombashi, Takashimaya Nihombashi often have a rotating Sanriku-region seasonal item.
Iwate and Miyagi antenna shops — small prefectural shops near Tokyo Station and Yurakucho carry bakery items from local producers, often including mekabu rolls.
Sendai and Ishinomaki — closer to the source, several local bakeries make mekabu-pan as a regular line.

Closing

A roll comes out of the oven at 7 a.m. in central Tokyo with strands of Sanriku seaweed running through the crumb. Apparently, the most maritime country in the developed world also kneads its coastline into its breakfast bread.