Bring balsamic to a boil in a small sauce pan, reduce to medium and reduce by about half and thick

Salt watermelon according to tase - I used about 1/4 teaspoon on all the watermelon and found it to be a bit insufficient

Grill watermelon 2-3 minutes each side - you can do this on a grill or use a grill pan on the stove

While watermelon is grilling, cut up the mozzarella into slices, then quarters

Let the watermelon cool and drain a bit so it doesn't get soggy

Arrange watermelon on a platter, top with mozzarella and basil

Drizzle with balsamic reduction

Serve immediately