In a medium-size mixing bowl, combine tomatoes, onion, cilantro, garlic, lime juice, tomatillo, and salt to taste. Mix well. Add 1/2 of the jalapeno pepper, and taste. If you desire your salsa with more of a kick, add the remaining 1/2 jalapeno. If you are satisfied with the salsa's heat, do not add the remaining jalapeno pepper. Cover the salsa, and chill until ready to serve.
