Place tomatoes, peppers, and onions in a grill basket and char on a grill over medium heat. When cool enough to handle, combine charred vegetables with remaining ingredients in a food processor and pulse until desired consistency. Store in a tightly covered container in the refrigerator until ready to use.
Serve with
Chicken Fajitas with Guacamole over grilled fish or chicken or as an appetizer with baked corn chips.