Dice onion fairly small. Mince garlic and cilantro. Skin and seed tomatoes, then dice medium.
Mix everything and cook to desired thickness. It can also be thickened with a little corn starch and water.
Can the salsa–use hot water process in pint jars for 15 min.
This makes a mild, tasty salsa. Add hot peppers (pre-roasted) for more zing.