Place tomatillos in a saucepan with water to cover; bring to a boil. Reduce heat to low; simmer until color begins to lighten and fruit is soft to the touch, 10 to 15 minutes.
2
Transfer tomatillos to a food processor or blender. Add jalapenos, 1/3 cup cilantro, garlic, salt, and pepper; blend until smooth. Cover with plastic wrap. Refrigerate at least 2 hours for best flavor.
