Kankoromochi (Goto Sweet Potato Mochi)

Nov 3, 2026 · By VanillaGoods

Baking Cakes cupcakes Medium

Chewy, mildly sweet mochi studded with chewy dried sweet potato. This home version dries the potato in the oven instead of in winter wind and mixes it into microwave mochi. Makes 12 pieces in about 2 hr 50 min.

Prep 20 min

Cook 130 min

Cooling 20 min

Total 2 hr 50 min

Yield 12 pieces

Diet Dairy free, Vegan

Ingredients

Adjust yield

pieces

10 ½ oz (300 g)sweet potato, peeled, sliced 2 mm (1/16 in) thick
1 ⅔ cups (200 g)glutinous rice flour (mochiko)
3 tbsp (40 g)sugar
1 cup (230 ml)water
2 oz (50 g)potato starch, for dusting

Fresh ingredient guides

Sweet potatoesHow to pick, season & nutrition · 114 kcal per 133 g

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Instructions

Heat the oven to 200 F (95 C) and line a baking sheet with parchment.
Spread the potato slices in a single layer and dry 90 to 100 minutes, flipping once, until leathery and chewy but not crisp. Cool, then chop into small pieces.
Whisk the rice flour, sugar and water in a large microwave-safe bowl until smooth. Cover loosely.
Microwave 2 minutes, stir well, cover and microwave 2 minutes more, stirring again and microwaving 1 minute until translucent and sticky.
Fold in the chopped dried potato with a wet spatula.
Dust a tray generously with potato starch, tip out the hot mochi, dust the top and pat into a rectangle 2 cm (3/4 inch) thick.
Let it cool 20 minutes, then cut into 12 pieces with an oiled knife.

Tips

Potato slices must be thin and leathery; thick pieces stay hard and wet.
Mochi is a choking hazard; cut small pieces for young children and older adults.
Dust everything with starch; the dough is very sticky.
Good with green tea.

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Recipe FAQ

How long does it take to make kankoromochi (goto sweet potato mochi)?

Plan on 20 minutes of prep and 2 hours 10 minutes of cooking, plus 20 minutes to chill. The recipe makes 12 pieces.

How should I store kankoromochi (goto sweet potato mochi)?

Best the day it is made. Wrap tightly and keep at room temperature for 1 day, or freeze and thaw before eating.

Can I make kankoromochi (goto sweet potato mochi) ahead?

It is at its best the day it is made; prepare it a few hours before serving.

Is this recipe vegan?

Yes, as written. Check that packaged ingredients such as chocolate, sprinkles and plant butter are labeled vegan.

Kankoromochi is a rice cake from Japan's Goto Islands in Nagasaki, made by combining mochi with kankoro, dried sweet potato. Serve it with green tea.

Estimated · per serving

Nutrition

Per serving = 1 of 12 servings this recipe makes.

93 Calories / serving

0.3g Fat

20.9g Carbs

1.5g Protein

3.6g Sugar

Whole recipe (12 servings): ~1116 cal · 4g fat · 251g carbs · 18g protein · 43g sugar

Estimated values per serving, calculated from standard ingredient data. Not verified Nutrition Facts; actual values vary with brands, measurements, and preparation.