- a 4-pound piece watermelon (preferably seedless)
- 2 pounds vine-ripened tomatoes (about 6 medium; preferably yellow)
- 1 teaspoon coarse salt (preferably sea salt)
- 1/2 small red onion
- 2 tablespoons fresh lime juice, or to taste
- 1 teaspoon finely grated fresh gingerroot
- 1/2 teaspoon sugar
- Remove rind and any seeds from watermelon. Cut fruit into 1 1/2-inch pieces and put in a large bowl. Cut tomatoes into 1 1/2-inch pieces. Add tomatoes and salt to watermelon, tossing to combine. Let mixture stand at cool room temperature 3 hours.
- In a colander set over a small saucepan drain mixture and transfer to a bowl. Simmer liquid until reduced to about 2 tablespoons and cool completely. Halve onion and thinly slice enough to measure 1/4 cup. Add onion to watermelon mixture. (For best results do not chill salad, as it will lose flavor.) In a small bowl stir together reduced watermelon-tomato juice, lime juice, gingerroot, and sugar.
- Just before serving, toss salad with juice mixture.