How about making an easy rice casserole with béchamel sauce and leftover mochi from New Year's? It's great for lunch!
I came up with a béchamel sauce using mochi cakes, so I decided to try using it to make a quick doria.
For the béchamel sauce with mochi cakes, you should try slicing the mochi cakes thinly so that they'll melt more easily and thicken the sauce a bit quicker.
Enjoy Japanese food around the world.