Fruit kimchi is a great way to minimize waste in the kitchen. It’s probably why watermelon rind kimchi is a common summer kimchi in Korea. To make it, cut the watermelon rind into cubes, then salt it thoroughly, using about 1 tablespoon for 4 to 6 cups of rind. Let sit for an hour before rinsing and mixing with the paste. Watermelon rind kimchi can be eaten right away or stored in an airtight container in the refrigerator for up to 3 days.