Add all ingredients to the pitcher of a blender. Blend until completely pureed. Add additional salt and pepper to taste (I usually go with a full teaspoon salt). Spread on pizza crust; add toppings and bake as desired.
If you don't have a blender, chop the fresh tomatoes and finely mince the garlic, then add them along with the other ingredients to a bowl. Stir until combined, taste, and add additional salt and pepper if desired.
Keeps refrigerated in an airtight container for 2-3 days.