Make sure stem is removed from tomatoes, quarter them and add them to the bowl of a food processor.
Roughly chop the onion and garlic cloves and add to the food processor.
For a milder salsa, slice the jalapenos in half and remove the seeds. If you want your salsa a bit spicier, slice the jalapeno, leaving the seeds in it.
Add the jalapenos to the bowl of the food processor as well as the cumin, salt, cilantro and fresh lime juice.