Uirō (ういろう) is a traditional Japanese wagashi (confection) made from rice flour, sugar, and water, then gently steamed until it develops a soft, chewy, and slightly springy texture. Known for its simple ingredients and elegant appearance, Uirō has been enjoyed in Japan for centuries and is especially famous in regions such as Nagoya, Yamaguchi, and Kyoto. Available in a variety of flavors including matcha, red bean, sakura, and black sugar, this versatile sweet is a favorite accompaniment to green tea.

Whether you're discovering Japanese desserts for the first time or recreating a classic tea-time treat, homemade Uirō is easy to prepare and wonderfully satisfying.

What is Uirō?

Uirō is a steamed rice cake made primarily with rice flour, sugar, and water. Unlike mochi, which is made from glutinous rice and has a stretchy texture, Uirō is softer, smoother, and firmer, with a pleasant chew. It is lightly sweet and often flavored with ingredients like matcha, black sugar, or sweet red beans.

Its minimalist recipe highlights the natural taste and texture of rice flour, making it a timeless Japanese confection.

Why You'll Love This Recipe

  • Soft and pleasantly chewy
  • Made with simple pantry ingredients
  • Naturally dairy-free
  • Easy to customize with different flavors
  • Perfect with Japanese tea
  • Great for beginners exploring wagashi

Ingredients

For the Basic Uirō

  • 150 g rice flour
  • 100 g granulated sugar
  • 250 ml water
  • 1 tablespoon cornstarch (optional, for a smoother texture)
  • Pinch of salt

Optional Flavorings

  • 1 teaspoon matcha powder
  • 2 tablespoons sweet red bean paste
  • 2 tablespoons black sugar or brown sugar
  • 1 teaspoon roasted black sesame paste
  • 1 teaspoon yuzu zest

Kitchen Equipment

  • Mixing bowl
  • Whisk
  • Fine mesh sieve
  • Heatproof steaming mold or loaf pan
  • Steamer with lid
  • Silicone spatula
  • Sharp knife

Preparation Time

  • Prep Time: 10 minutes
  • Cook Time: 30 minutes
  • Cooling Time: 20 minutes
  • Total Time: 1 hour

Servings: 8 slices

Step 1: Prepare the Batter

In a mixing bowl, combine the rice flour, sugar, optional cornstarch, and salt.

Gradually pour in the water while whisking continuously until the batter becomes completely smooth.

If making a flavored version, stir in the matcha powder, black sugar, or sesame paste at this stage.

Strain the batter through a fine sieve to remove any lumps.

Step 2: Prepare the Steamer

Bring water in a steamer to a gentle boil.

Lightly grease the steaming mold or line it with parchment paper for easier removal.

Step 3: Steam the Uirō

Pour the batter into the prepared mold.

Cover the mold loosely with aluminum foil or a clean kitchen cloth to prevent condensation from dripping onto the batter.

Steam over medium heat for about 30 minutes, or until the center is fully set.

Insert a skewer into the center; it should come out clean.

Step 4: Cool

Remove the mold from the steamer.

Allow the Uirō to cool completely at room temperature.

Once cooled, carefully remove it from the mold.

Step 5: Slice and Serve

Use a sharp knife lightly moistened with water to cut the Uirō into neat rectangles or diamond-shaped pieces.

Serve at room temperature with freshly brewed green tea.

Garnish

Enhance your Uirō with:

  • Matcha powder
  • Roasted black sesame seeds
  • Kinako (roasted soybean flour)
  • Sweet red bean paste
  • Fresh yuzu zest
  • Edible cherry blossom petals

Serving Suggestions

Uirō pairs beautifully with:

  • Matcha
  • Sencha
  • Hojicha
  • Genmaicha
  • Japanese tea ceremony sweets
  • Fresh seasonal fruit
  • Nerikiri
  • Yokan

Tips for Perfect Uirō

  • Sift the rice flour to ensure a smooth batter.
  • Cover the mold while steaming to prevent excess moisture.
  • Avoid over-steaming, which can make the cake too firm.
  • Allow it to cool completely before slicing.
  • Wet the knife between cuts for clean, smooth slices.
  • Use high-quality rice flour for the best texture.

Delicious Variations

Matcha Uirō

Mix matcha powder into the batter for a vibrant green color and earthy flavor.

Black Sugar Uirō

Replace white sugar with Okinawan black sugar for a rich caramel-like sweetness.

Red Bean Uirō

Fold sweet red bean paste into the batter before steaming for extra flavor and texture.

Sakura Uirō

Add finely chopped salted cherry blossoms for a delicate spring-inspired dessert.

Sesame Uirō

Blend black sesame paste into the batter for a nutty, aromatic variation.

Storage

Store Uirō in an airtight container at room temperature for up to 2 days.

For longer storage, refrigerate for up to 5 days, then allow it to return to room temperature before serving for the best texture.

Freezing is not recommended, as it may affect the cake's soft, chewy consistency.

Nutritional Information (Per Slice)

  • Calories: 140
  • Protein: 2 g
  • Carbohydrates: 32 g
  • Fat: 0.3 g
  • Fiber: 1 g
  • Sugar: 13 g
  • Sodium: 20 mg

Values are approximate and may vary depending on the ingredients used.

Frequently Asked Questions

What is the difference between Uirō and Mochi?

Uirō is made from rice flour and steamed, giving it a smooth, firm, and slightly chewy texture. Mochi is made from glutinous rice that is pounded into a stretchy, elastic dough.

Can I use glutinous rice flour?

Traditional Uirō is made with regular rice flour. Glutinous rice flour will create a softer, stickier texture that is closer to mochi.

Why is my Uirō too dense?

Overmixing, using too little water, or over-steaming can result in a dense texture. Mix gently and steam only until fully set.

Can I make Uirō without a steamer?

Yes. You can place the mold on a heatproof rack inside a large pot with a small amount of boiling water, cover tightly, and steam using the pot as a makeshift steamer.

Is Uirō gluten-free?

Yes, when made with pure rice flour and gluten-free flavorings, Uirō is naturally gluten-free.

Final Thoughts

Uirō is a classic Japanese steamed rice cake that celebrates the beauty of simplicity. With its soft, chewy texture, gentle sweetness, and endless flavor possibilities, it has remained a beloved wagashi for generations. Whether enjoyed in its traditional form or infused with matcha, black sugar, or red bean, homemade Uirō is a delightful dessert that pairs perfectly with a warm cup of Japanese tea and offers a taste of Japan's rich confectionery heritage.