Microwave Method

1. Wet all sides of the frozen mochi cake and place it on a microwave-safe plate. The water helps prevent the mochi from sticking to the plate as it cooks. Alternatively, you can line the plate with seaweed, soy powder or parchment paper to prevent sticking.

2. Microwave the frozen mochi cake for 1 minute.

3. Remove it from the microwave and test it with your fingers to see if it's hot. If it's not hot, return it to the microwave and cook in 30-second intervals until steaming hot.

Toasting Method

1. Line a microwave-safe plate with parchment paper and set the frozen mochi on top. Make the parchment paper larger than the mochi cake so you can lift the edges of the paper later.

2. Microwave the mochi cake for about 30 seconds so it's partially cooked before placing it in the oven.

3. Lift the edges of the parchment paper and transfer the mochi cake to a baking tray. Preheat the oven or a toaster oven to about 375 degrees Fahrenheit.

4. Bake the mochi cake for about 5 minutes, checking it frequently to prevent burning. As it cooks, the mochi cake puffs up and the top begins to brown. Remove it from the oven after 5 minutes or when the top is medium golden brown.