3/4 cup red wine vinegar
1 Walla Walla onion, sliced in thin rings
8 cups Yellow Sunshine watermelon, seeded and cubes
1/4 cup lime juice
2 tablespoons Anaheim pepper, halved, seeded and sliced
1 tablespoon fresh basil, chopped
1 tablespoon fresh lemon balm, chopped
4 ounces feta cheese, crumbled
1/4 teaspoon cayenne pepper