Watermelon, Heirloom Tomato and Feta Salad

Combine the tomatoes, watermelon, and mint in a large serving bowl. In a small bowl, whisk together the oil, vinegar, 1 tsp. salt, and the red pepper flakes. Pour over the tomato mixture and toss well. Let the mixture sit for 15 minutes at room temperature. Fold in the feta and toss well.

Serve, sprinkled lightly with the coarse sea salt, if using (use about 1/2 tsp. - it adds a bit of texture); this salad can sit for 1 to 2 hours at room temperature.