A good authentic Mexican salsa recipe is the Food Network's restaurant-style salsa, which calls for canned tomatoes, chopped onions and fresh spices. This recipe creates 12 servings in about one hour with just 15 minutes of preparation.
Start by combining 2 10-ounce cans of diced tomatoes and peppers with 1 28-ounce can of whole tomatoes in a large bowl. Add the canned tomatoes' juice to the mixture as well. Then add 1/2 cup of cilantro, 1 clove of minced garlic, 1/4 cup of chopped onions and 1/4 teaspoon of salt. Additionally, stir in 1/4 teaspoon of ground cumin, the juice of half a lime and 1/4 teaspoon of sugar.
Place all of these ingredients into a large blender or food processor for mixing. If you do not have a blender or food processor, mix the ingredients into a large bowl by combining a few at a time. Keep blending each set of ingredients as you add it to the mixture. Pulse the food processor for 10 to 15 pulses until the salsa's consistency suits your personal preference. Sample the flavor with a tortilla chip, and then add additional spices to the salsa until it tastes right.
Refrigerate the salsa for at least one hour before serving with tortilla chips.