Peel the roasted garlic. Remove the jalapeno stem (leave seeds for more heat, remove for less). Transfer everything — charred tomatillos, jalapeno, onion, garlic, all the juices from the pan — into a blender. Add cilantro, lime juice, cumin, and salt. Pulse until you reach your preferred consistency: smooth for enchilada sauce, slightly chunky for a dipping salsa. Taste and adjust: more lime for tang, more salt for depth, more jalapeno for heat.