Chop tomatoes into 1/4 inch pieces; transfer to a medium bowl. Add onion, chile, garlic, cilantro, and lime juice; season generously with salt. Mix to combine. Let stand 15 minutes to develop flavor.
Alternately, you can roughly chop the tomatoes, chile, garlic and cilantro and put in a food processor with the rest of the ingredients. Pulse it and a few times until it is the consistency you would like.
Taste and add more lime juice and/or salt. Add a little sugar if necessary.
Wrong time of year for fresh, ripe tomatoes? Try our “Winter Salsa” recipe using canned tomatoes.