In food processor put in the 2 cans of diced tomatoes (undrained), then add the Rotella tomatoes with chilies (mild). Add in the chopped onion, cumin, chipolte pepper, salt and pepper, sugar, lime juice and cilantro. Add in the bbq. Sauce last. Pulse until well blended put in plastic container and store in fridge until ready to use. Serve with grated cheese and chips.