Add the onion, garlic, and jalapeño to the bowl of a food processor and pulse a few times to chop until the onion pieces are about ¼-inch size.
½ cup white onion, 1 clove garlic, ½ jalapeño
Drain off the liquid from the can of diced tomatoes with green chilies and discard the liquid. Add the tomatoes and chilies from the can to the food processor.
10 ounce can diced tomatoes with green chilies
Add the fire roasted diced tomatoes with their juices from the can to the food processor, along with the fresh cilantro, lime juice (start with a small amount of lime juice and add more, to taste), ground cumin, salt and sugar.
14.5 ounce can fire roasted diced tomatoes, ½ cup fresh cilantro leaves, juice from ½ of a lime, ¼ teaspoon ground cumin, ¼ teaspoon salt, pinch of sugar
Pulse until the salsa reaches your desired consistency.
Taste salsa on a tortilla chip and adjust the lime juice, salt, or sugar as needed.
For the best taste, chill salsa in the refrigerator for at least 1-2 hours before serving to allow the flavors to develop.