This salsa will make everyone want to dance!
Combine the tomatoes, onion, cilantro, garlic, lime juice, tomatillo, and salt to taste in a mid-sized mixing bowl and mix well.
Add about 1/2 of the jalapeno and give it a taste. If it's already spicy enough, skip the rest of this step. If you need some more heat, add the other half of the jalapeno.
Put a cover over the bowl, and let it chill in the fridge until you want to use it.