Gently toss tomatoes, onion, jalapeños, garlic, cilantro, and lime juice in a small bowl; season with salt to taste.
If the salsa is somewhat lackluster, add a pinch or two of sugar and a small drizzle of the vinegar.
Let sit at room temperature for up to an hour (or as long as you can wait) to blend the flavors, then store in the refrigerator.