Creating watermelon mochi is straightforward and rewarding. Follow these detailed steps to achieve the perfect texture and flavor:

Step 1: Prepare Watermelon

1. Cut the Watermelon: Start by cutting the watermelon in half. Scoop out the flesh, ensuring you remove any seeds.
2. Blend: Place the watermelon flesh in a blender and blend until smooth to yield 300 g of watermelon juice.

Step 2: Make Mochi Dough

3. Mix Dry Ingredients: In a large bowl, combine the glutinous rice flour, cornstarch, and sugar.
4. Combine with Watermelon Juice: Gradually add the watermelon juice to the dry ingredients, stirring continuously until well combined. For a smoother texture, sift the mixture.

Step 3: Microwave

5. Cover and Microwave: Cover the bowl with plastic wrap and poke small holes to allow steam to escape. Microwave on high for 5 minutes.

Step 4: Add Butter

6. Incorporate Butter: While the mixture is still hot, stir in the butter until fully melted and integrated.
7. Knead the Dough: Allow the dough to cool to room temperature, then knead for about 5 minutes until it becomes smooth and elastic.

Step 5: Chill

8. Refrigerate: Transfer the dough to a container lined with parchment paper. Flatten the surface and refrigerate for at least 3 hours to set.

Step 6: Shape

9. Dust and Cut: Dust the surface with cooked glutinous rice flour to prevent sticking. Cut the chilled dough into strips and then into bite-sized pieces.

With these steps, you’ll have beautifully crafted watermelon mochi ready to enjoy!