A favorite local recipe from Hawaii, you can make this easy mochi at home in the microwave or oven. Choose any jello you like for flavorful and colorful mochi.
Mix mochiko, sugar, jello, coconut milk, water, and food dye (if using) in a large mixing bowl.
Pour mochi batter into a greased microwaveable bundt pan or 8x8" square dish.
For Microwave
Cover with plastic wrap or another microwave safe dish. If using a bundt pan, microwave 6-8 minutes. If using a square dish, microwave 8-9 or until the center is no longer liquid.
For Oven
Cover baking dish tightly with aluminum foil and bake at 350 degrees F for 45-55 minutes, or until center is solid and mochi turns slightly translucent.
After Cooking
Let mochi cool enough to handle and remove from dish onto a surface dusted with katakuriko. Using a pizza cutter or plastic knife, cut into small rectangles, dusting with katakuriko as needed to keep mochi from sticking.
Leftover mochi can be kept in an airtight container at room temperature for 1-2 days.
Edited in 2025: my original recipe called for 1 cup water, but recently I found that it made my mochi too liquidy and I have no idea what changed! In any case, I decreased the amount to 1/2 a cup, and it was perfect. If you do 1/2 a cup and think that it's too dry, feel free to add that other 1/2 cup. I'm not sure if it has to do with the brand of coconut milk or some other formulation change in another ingredient.