1. Cut the watermelon, squeeze the pulp into juice, and clean the husk for later use.
2. Filter the watermelon juice into the pot, add 50 grams of white jelly to heat, put it to warm and pour it back into the melon shell.
3. Pour milk, sugar, and 20 grams of white jelly into the pot and boil it. Pour it into a container and refrigerate until it solidifies.
4. Use a mold to cut out the jelly one by one, then put it in the melon shell and refrigerate until solidified, and cut into pieces.
