Mediterranean Fresh Herbs and Tomato Salad

medium-size tomatoes (on-the-vine tomatoes or heirloom tomatoes preferred), sliced into wedges

medium-size red onion, thinly sliced into half moons

garlic cloves, chopped or minced

packed cup chopped fresh parsley leaves

packed cup chopped fresh dill

ground sumac

Salt and freshly ground pepper

lemon, juice of

white wine vinegar

extra virgin olive oil

Feta cheese, optional