Begin by finely chopping the onion, then rinse it under cold water for about 2-3 minutes. This soaking reduces the sharpness of the onion and enhances its sweetness.

In a blender, combine the drained onion, chopped jalapeños, and a couple of cloves of minced garlic. Add a pinch of salt and lime juice for brightening flavors. Blend for about 10-15 seconds until everything is finely chopped but not pureed.

Next, add your tomatoes into the blender along with a handful of cilantro, if desired. Pulse blend for another 10-15 seconds until you achieve a slightly chunky texture.

Once blended, taste your salsa and adjust with more lime juice if needed or cayenne pepper for heat.

Transfer your salsa into a mason jar and let it sit for about 30 minutes at room temperature to allow flavors to meld.