I live in Alabama, which means summers are hot and steamy — and absolutely no other food combats the heat and humidity the way that watermelon does. It’s juicy, crisp, sweet, and supremely hydrating.

The Tap Test: Watermelons are not a musical instrument, but picking a ripe watermelon will be music to your ears. Pick up the fruit and give it a light tap. If it gives back a hollow sound, it usually ...