Tomato, Peach, and Basil Salad

Name: Tomato, Peach, and Basil Salad
Cook time: 10 min
Total time: 10 min
Cuisine: European, American, Mediterranean
Ingredients: 1/2 small red onion, thinly sliced; 1 tbsp. red wine vinegar; Kosher salt and pepper; 1 lb. heirloom tomatoes; 1 lb. yellow peaches or nectarines; 2 tbsp. olive oil; 1/4 c. basil leaves; 2 oz. feta, broken into pieces