If there are unfinished mochi waffles that can still be eaten later, you may freeze those mochi waffles. To properly freeze them, let the mochi waffles cool down completely.  Put the cooked mochi waffles on a baking sheet and freeze them. Once frozen solid, put the mochi waffles in an airtight container freezer-safe bag, squeezing out extra air.  You can store them for up to 3 months in this state. Once you’re going to eat the frozen mochi waffles, thaw them in a toaster oven until they are hot.  You can also toss them back in the pan on medium to medium high heat.