recipe for heirloom tomatoes

Ingredients: 4-5 heirloom tomatoes, sliced or chopped 1/4 cup fresh basil leaves, torn or chopped 1/4 cup extra virgin olive oil 2 tablespoons balsamic vinegar Salt and pepper, to taste 1/4 cup crumbled feta cheese or fresh mozzarella (optional) 1/4 red onion, thinly sliced (optional)