This authentic Japanese zenzai recipe features tender homemade adzuki beans simmered into a fragrant, slightly sweet soup and finished with chewy mochi. Naturally vegan and gluten-free, this warm red bean soup is comforting on cold days and elegant enough for special occasions or a simple, satisfying treat.
What is Zenzai?
Zenzai is a classic Japanese dessert soup made from azuki (adzuki) red beans and commonly served with mochi, the soft, sticky rice cake. Although beans in a dessert can seem unusual if you haven’t tried them before, sweet red beans are a staple in many East Asian sweets. The beans are cooked until soft and naturally sweet, creating a silky, comforting broth that pairs beautifully with the chewy texture of mochi.
Zenzai can be enjoyed either hot or chilled. Traditional preparations vary by region and family, and you can make it from scratch using dry adzuki beans or use pre-cooked, sweetened beans for convenience. For the mochi, you can use store-bought microwavable or frozen mochi, make mochi with glutinous rice flour, or prepare fresh mochi the traditional way.
What Makes This Recipe Great
This homemade zenzai is simple to make and highly adaptable. It’s a popular winter dessert because it warms from the inside out, but served chilled it becomes a refreshing sweet course for warmer months. The recipe is naturally plant-based and gluten-free, offering a fiber-rich, protein-containing dessert that feels indulgent without being heavy. You can control the sweetness, texture, and serving temperature to suit your preferences, and it’s an excellent way to introduce friends and family to a traditional Japanese flavor.
Ingredient Notes
- Dry adzuki (adzuki) beans: You can cook these from scratch or substitute canned, sweetened whole adzuki beans if you prefer convenience.
- Water: Used to simmer the beans into a soup.
- Sugar of choice: Brown sugar, coconut sugar, or another sweetener works; start with a moderate amount and adjust to taste.
- Pinch of salt: Enhances the sweetness and balances flavors.
- Mochi: Sticky rice cake. Prepared microwavable mochi or frozen rice cakes are the easiest options.
How to Make Japanese Red Bean Soup / Zenzai
- Prepare the adzuki beans. If using dry beans, rinse 1 cup of beans well and place them in a large pot with 3 cups of cold water. Bring to a boil over medium heat, then reduce to a gentle simmer.
- Simmer the beans for 1–2 hours, checking occasionally and adding water if the liquid reduces too much. The beans should become soft and tender when fully cooked.
- When the beans are tender, ensure there is enough cooking liquid left to form a soup. Do not drain the beans; the liquid is part of the zenzai.
- Gently stir in 1/2 to 2/3 cup of your preferred sugar (adjust to taste) and a small pinch of salt. Keep the heat low and stir until the sugar is dissolved and flavors meld. Taste and adjust sweetness.
- To serve, ladle the beans and some of the sweet broth into small bowls and top each serving with warmed or toasted mochi. Serve hot for a cozy dessert or chilled for a lighter variation.
Serving Tips
- Enjoy zenzai hot straight from the stove for maximum comfort, or chill it and serve cold during warmer weather. Both ways highlight the sweet, subtle flavor of adzuki beans.
- Top with toasted nuts, a sprinkle of coarse salt, or a few roasted sesame seeds for extra texture and flavor contrasts if desired.
Storage Tips
- Allow leftovers to cool completely, then transfer to an airtight container and refrigerate for up to 2–3 days. Reheat gently on the stove or enjoy chilled. Mochi is best added fresh when serving.
Recipe FAQs
Zenzai is the Japanese term for a sweet red bean soup or dessert prepared with azuki beans, often served with mochi.
What is the difference between oshiruko and zenzai?
The names zenzai and oshiruko are regional variations for similar red bean soups in Japan. Preparation and texture may vary by area and family tradition, with some versions smoother and others chunkier.
More Authentic Asian Recipes
Tsukimi Dango
Sticky Rice Dumplings
Matcha Butter Mochi Cake
Korean Vegetable Pancakes
Gluten-Free Hotteok
If you try this recipe, please leave a rating and a comment. Share photos of your zenzai for others to enjoy the inspiration.
Japanese Zenzai Recipe (Sweet Red Bean Soup)
Servings: 8–10
Prep: 5 mins • Cook: 2 hrs • Total: approx. 2 hrs 5 mins
This simple zenzai uses tender adzuki beans simmered until soft, lightly sweetened, and served with mochi for a comforting, naturally vegan dessert.
Ingredients
- 1 cup dry adzuki beans (rinsed)
- 3 cups water
- 1/2–2/3 cup sugar of choice (brown, coconut, date, or granulated), to taste
- Pinch of salt
- About 1/2 cup mochi per serving (prepared or microwavable)
Instructions
- Rinse adzuki beans and place them in a pot with 3 cups cold water. Bring to a boil, then lower to a simmer.
- Simmer gently for 1–2 hours until beans are soft, adding water if needed to maintain a soupy consistency.
- Keep the cooking liquid with the beans; do not drain. Adjust the amount of liquid to suit a soup-like or thicker texture.
- Over low heat, stir in sugar and a pinch of salt until dissolved. Taste and adjust sweetness.
- Ladle beans and broth into serving bowls and add warmed mochi. Serve hot or chilled.
Notes
Serve zenzai hot in winter for a warming dessert or chilled in summer. Store leftovers in the refrigerator for 2–3 days. Mochi is best added fresh when serving.
