This recipe is amazing! I found it on http://www.real-foods.net/, and adapted it for our family.
2-3 ripe tomatoes (we usually use 2 large tomatoes, and a can of diced... it helps make it really juicy)
1 medium yellow onion
2 cloves of garlic
1 sm. bunch of cilantro
The juice of 1 lime
1/2 teaspoon sea salt
Throw it all in a food processor and pulse until you have the consistency that you like.