Here's how to cut a watermelon into perfect cubes - the easiest, least messy, most foolproof way I've found to cut a quartered watermelon into cubes! Use the cubes in any watermelon recipe you need, or just eat them as a delicious healthy summertime snack on their own.
Quarter the watermelon by slicing it in half lengthwise, then in half again lengthwise.
Use a sharp knife to slice the flesh of the watermelon cross-wise, all the way to the rind, but not through the skin.
Slice each side parallel to each opposite cut side (perpendicular to the side you're cutting), length-wise, all the way to the rind but not through the skin.
Slice along the curve of the rind where it meets the flesh on both sides, inserting the knife about halfway into the watermelon.
Remove the cubes with your hands or dump into a bowl.
Remove any cubed watermelon still stuck to the rind with your hands or with a paring knife. Serve as is, or use in a recipe that uses cubed watermelon.