Add tomatoes, onion, jalapeño, cilantro, garlic, lime juice, salt, black pepper, and cumin to a food processor.
For chunky salsa, pulse just a few times until combined.; For smooth salsa, blend longer until creamy and dip-ready.
Add more lime juice for tang, more salt for balance, or an extra jalapeño for heat if needed.
Let the salsa sit for 10 minutes before serving (this helps the flavors meld).; Serve with chips, tacos, grilled meats, or spooned over eggs!