Custard

1. Add milk Add the milk to a small saucepan and heat over medium heat to boiling.
2. Add rest of ingredientsSlowly whisk in the flour, eggs, and sugar.
3. Heat until bubblingHeat on low heat until bubbling and thick, about 5-10 minutes.
4. Pour custardPour the custard through a mesh sieve to remove any clumps. Let the custard cool.
5. Pipe and freezeScoop custard into a frosting bag and pipe onto a cookie sheet into 8 dollops. Freeze for one hour.

Mochi

1. Add ingredients to bowlAdd sweet rice flour, sugar, salt, water, and a few drops of food coloring to a microwave-safe bowl. Cover the bowl loosely with plastic wrap.
2. MicrowaveMicrowave for 1 minute, remove plastic, then stir. It will not be smooth after stirring it. 
3. Continue microwavingReplace the plastic wrap and continue microwaving for 1-minute intervals until mochi has a translucent quality and feels gummy. This usually takes 3-4 minutes. Allow to cool slightly, enough to handle with your hands.
4. Shape mochiPlace the mochi on a cutting board generously coated in potato starch. Sprinkle potato starch on top of the mochi. Shape the mochi into a half-inch thick disk.
5. Divide into piecesUsing a knife or bench cutter, divide the mochi into eight pieces.
6. Roll and flattenCoat your hands with potato starch and roll each piece into a ball, and then flatten it into a disk.
7. Fill with custardPlace a ball of frozen custard in the center. Use your fingers to pinch the Mochi closed around the custard.