Prep the ingredients. Wash and chop all vegetables. If you like milder salsa, remove the seeds and membranes from your jalapeños. Leave them in for more heat.
Blend or pulse. In a food processor, add tomatoes, onion, jalapeño, garlic, and cilantro. Pulse several times until you reach your desired consistency. For a chunkier texture, blend less; for a smooth finish, blend longer.
Add lime and seasonings. Pour the mixture into a bowl. Stir in lime juice, salt, pepper, and optional sugar or olive oil. Taste and adjust seasoning, more lime for brightness, salt for balance, or jalapeño for spice.
Let it rest. Cover and refrigerate for at least 30 minutes before serving to let the flavors meld beautifully.
Serve and enjoy. Garnish with extra cilantro if desired, and serve with tortilla chips, tacos, or grilled meats.