For best results, use high-quality, ripe tomatoes.
Canned diced tomatoes with green chiles or fire-roasted varieties can be substituted for added flavor.
For a stronger onion note, you may omit the green onions and increase the red onion to ¾ cup.
To adjust heat levels, retain jalapeño seeds or replace with a serrano for extra spice. Chipotle peppers in adobo sauce offer a smoky, spicier variation.
Optional additions include ½ of a bell pepper, poblano, or Anaheim pepper.
To thin the salsa, a splash of tomato juice or tomato sauce may be added.