Steamed Bun Day (Mushipan no Hi)

What Is Steamed Bun Day?

June 4th is "Mushipan no Hi" (Steamed Bun Day). The date comes from a wordplay where "mu" (6) and "shi" (4) together sound like "mushi," meaning "steamed." This anniversary was established by Nichiryo Baking Co., Ltd., headquartered in Sapporo, Hokkaido, and is registered with the Japan Anniversary Association. Its aim is to encourage people to enjoy mushipan (Japanese steamed cakes), which are easy for children to eat, more often for breakfast and snacks.

The History and Cultural Background of Mushipan

Steamed wheat-dough foods have roots in Chinese foods such as mantou, and manjū buns are said to have reached Japan in the Muromachi period. In the Meiji era, baking soda became easier to obtain, and mushipan -- which needs no fermentation and can be made in a bamboo steamer -- came to be eaten as a children's snack and as a substitute for rice.

• Brown-rice buns and substitute foods: Around the Rice Riots of the Taishō era, a steamed bun containing brown rice called "genmai pan" appeared, and after WWII, mushipan made from rationed flour was eaten as a substitute food and snack.
• A store staple: As supermarkets and convenience stores spread, major bakeries began producing mushipan, making it a familiar product.
• Endless variations: Alongside traditional flavors like brown sugar, mugwort, and sweet potato, new ones such as cheese and chocolate have emerged.

The Science Behind Mushipan's Delicious Texture

The fluffy texture of mushipan comes from the combination of steam heating and the structure of the batter.

• The effect of steam heating: Unlike an oven, steam heats the batter evenly without drying it out, resulting in a moist finish.
• The role of baking powder: Heat causes the baking powder to release gas, which makes the batter rise and gives the bun its light texture.
• Low in fat: Many mushipan recipes use very little oil or butter, giving it a simple, gentle flavor.

Interesting Facts About Mushipan

• Mushipan vs. cupcakes: Mushipan is cooked with steam, while cupcakes are baked in an oven—resulting in different textures and flavors.
• Chinese steamed cakes: The Chinese dim sum "ma lai go" is also a kind of steamed cake, eaten with tea or for breakfast.
• Rice-flour mushipan: In recent years, mushipan with rice flour added for a chewy texture has also appeared.
• Easy to make at home: Simple methods using pancake mix and a microwave have become widespread.

Ways to Spend Steamed Bun Day

• Try making mushipan at home and compare the results using a steamer versus a microwave.
• Taste-test different flavors of mushipan, such as brown sugar, matcha, and cheese.
• Learn about the history of mushipan, such as genmai pan and substitute foods, to discover the story behind a familiar treat.
• Look for specialty mushipan at local bakeries or Japanese confectionery shops.

A Simple, Gentle Flavor That Reminds Us of Life's Small Joys

June 4th's Steamed Bun Day is a chance to rediscover the charm of mushipan, made using a time-honored method. Its fluffy texture and gentle sweetness bring a sense of nostalgia. Let this day be your invitation to explore the rich world of mushipan and savor the joy and depth of Japanese food culture.