This is a GF Japanese American confection, made of MOCHIKO, also called sweet rice flour. The box she showed me is from KODA FARMS, also says Blue Star Brand on the box, also that the only ingredient is Rice and that their facility is dedicated to rice processing and suitable for gluten-free diets.
Buy it in an Oriental Store. In regular grocery stores, if you find it, it will cost three times as much.
5 eggs, beaten 1 t. baking powder
3 c. cold milk 2 cups Mochiko
2-1/2 c. sugar 1 cube butter, melted and cooled
1 t. vanilla
Combine beaten eggs, milk, vanilla, sugar, and baking powder. Add Mochiko. Combine until smooth. Mix in melted and cooled butter. Pour into 13” X 9” x 2” pan. Bake at 35O’ for 1 hour. Custard Mochi is ready when golden brown and edges are deep golden brown. Cut into 2” x 2” cubes.
From my gourmet mom-in-law, Pat