6 tomatoes, preferably Roma (or 3 large tomatoes)
½ medium onion, finely chopped
1 clove garlic, finely minced
2 serrano or jalapeño peppers, finely chopped
3 tablespoons cilantro, chopped
juice of 1 lime
1/8 teaspoon oregano, finely crushed
1/8 teaspoon salt
1/8 teaspoon pepper
½ avocado, diced (black skin)