One of my favorite Japanese treats is daifuku manju: sweetened mochi (rice cake) filled with an (sweet bean paste) that is intended to be eaten with tea. I used to love to stop at Benkyo-do in Japantown for a manju sampler: white mochi with red koshi-an (smooth bean paste), pink mochi with white koshi-an, green tea mochi with red tsubushi-an (chunky bean paste). Lately, I have been intrigued with how to infuse my favorite Asian flavors into traditional western pastries, and since cupcakes afford so much flexibility with ingredients and textures, they seemed like a good starting point.
For the recipes, read on.
I wanted the cupcake to mimic the sensation of biting into chewy, soft daifuku manju, so I knew that the cupcake batter needed to contain mochiko flour, and the an would need to make an appearance, too. But I also love the flavor of green tea with manju, so I figured: why not use some matcha powder to whip up some green tea frosting? After tracking down a few recipes online, I had a good base to start with. I made my own an, but you can find it premade in Japanese grocery stores (though it tends to be on the sweet side . . . if you make your own, you can control the sugar).
P.S. When you cut the cupcakes in half, they look like those crazy-haired, naked troll dolls that I used to collect back in the '80s.