Serve this fresh salsa as a topping for tortilla chips or as a condiment for grilled steak or shrimp.
In a medium bowl, stir together tomatoes, white onion, jalapeno, garlic, and fresh lime juice. Season with salt and pepper and stir to combine. Let sit at least 15 minutes (or, covered, up to 4 hours). Stir in cilantro leaves just before serving.