Scatter watermelon, tomatoes and finish with feta and mint.
Drizzle with balsamic glaze and sprinkle with salt (preferably Fleur de Sel or other coarse salt) and pepper.
Serve immediately.
Notes
Balsamic vinegar glaze can be found in the vinegar section at many supermarkets. If unavailable, boil ¾ cup balsamic vinegar in a small saucepan until reduced to 3 tablespoons, 6 to 7 minutes.
Recipe by Riegl Palate at https://www.rieglpalate.com/watermelon-feta-and-arugula-salad/