Bracken Starch Mochi with Roasted Soybean Flour

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A beloved summer treat from Japan, bracken starch mochi is a cool, jiggly bite coated in nutty roasted soybean flour and a whisper of sugar. The texture is springy and translucent, similar to a soft jelly cake, and the dusting adds a warm, toasty aroma that balances the gentle sweetness inside.

Nutrition Facts

Per serving (estimated)

• 160 kcalCalories
• 3 gFat
• 0.5 gSaturated Fat
• 30 gCarbs
• 2 gFiber
• 15 gSugar
• 5 gProtein
• 10 mgSodium
• 220 mgPotassium
• 40 mgCalcium
• 1.8 mgIron
• 0 mgVitamin C
• 5 mcgVitamin A

Ingredients

For the Mochi

• 1/2 cup warabiko (bracken root starch)
• 1 1/2 cups water
• 2 tablespoons granulated sugar
• 1/2 teaspoon neutral oil, for greasing

For the Kinako Coating

• 1/2 cup kinako (roasted soybean flour)
• 3 tablespoons granulated sugar
• Pinch of fine sea salt

Directions

1. In a medium heavy-bottomed saucepan, whisk together the bracken starch, water, and sugar until completely smooth with no lumps visible.
2. Place the pan over medium heat and stir constantly with a silicone spatula, scraping the bottom and sides, until the mixture turns glossy, thick, and translucent, about 7 to 9 minutes. Do not let it boil hard or it will turn gummy.
3. Lightly oil an 8-inch square baking dish and pour the hot mixture in. Tap the dish gently on the counter to level the surface and pop any air bubbles.
4. Let the pan cool to room temperature, then refrigerate for at least 1 hour until the mochi is fully set and holds its shape when cut.
5. While the mochi chills, stir together the roasted soybean flour, sugar, and salt in a shallow bowl until evenly combined.
6. Loosen the edges of the chilled slab with a thin knife and turn it out onto a clean cutting board. Cut into 1-inch cubes using a knife lightly moistened with water.
7. Place the cubes in a large bowl, sprinkle about two-thirds of the soybean mixture over them, and gently toss until each piece is coated on all sides.
8. Add more coating as needed and serve immediately while the cubes are cool and springy, with extra kinako-sugar on the side for dipping.

Cook’s Notes

• Warabiko (bracken starch) is essential for the signature translucent, jiggly texture; do not substitute with mochiko or sweet rice flour, which produce a chewier, opaque result.
• Stir the mixture constantly while heating, as bracken starch scorches quickly and can form lumps if left unattended.
• Serve the mochi the same day it is made for the freshest texture, as it firms up and loses its bouncy quality after 12 to 24 hours.
• If warabiko is unavailable, a 1:1 swap with tapioca starch will give a slightly chewier but still pleasant jelly-like bite.
• Lightly wetting your knife and hands before cutting and handling keeps the sticky surface smooth and prevents the cubes from tearing.

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