1. Preheat the oven to 375 degrees F (190 degrees C). Line a 9x9-inch baking pan with banana leaves or parchment paper and coat with cooking spray.

2. Whisk rice flours, baking powder, and salt together in a large bowl, then stir in the water and coconut milk. Add ube spread and ube extract. Fold in macapuno and 1 tablespoon muscovado. Pour into the prepared pan.

3. Bake in the preheated oven until top starts to crack and leaves turn brown, about 35 minutes. Brush top with 1 tablespoon butter, then bake until a toothpick inserted in center comes out clean, about 20 minutes more.

4. Melt remaining 2 tablespoons butter in a small saucepan over medium heat. Stir in 1/4 cup muscovado sugar; cook, stirring, until it starts to boil. Remove from heat and pour over warm mochi, covering evenly. Sprinkle with toasted coconut. Let cool, at least 30 minutes.

5. Use banana leaves to lift mochi out of the pan. Cut into 25 small squares; cut squares diagonally into triangles.

Cook's Notes:

Macapuno are sold in 24- to 32-ounce jars, near other preserved fruits at Asian markets. In a pinch, you could use sweetened shredded coconut instead.

Ube yam spread, a sweet paste made from purple yams and sweetened condensed milk, is common at Asian markets. Feel like making your own? Try this recipe

Substitute brown sugar for muscovado sugar if desired.