In a blender or food processor, combine the cooked tomatillos, cilantro, quartered onion, jalapeños, whole garlic cloves, lime juice, and a pinch of salt. Blend until smooth. Taste and adjust seasoning, adding more salt or lime juice as needed.
½ cup fresh cilantro, 1 small onion, 1-2 jalapeños, 2 cloves garlic, 1 tablespoon lime juice, Salt to taste