Mexican Salsa Verde

Name: Mexican Salsa Verde
Cuisine: Mexican, Latin American, American
Ingredients: 8 medium tomatillos, husked and rinsed; 1-2 fresh serrano or jalapeño chiles (adjust for desired heat), stemmed; 1/2 medium white onion, peeled and quartered; 2 garlic cloves, peeled; 1/2 cup fresh cilantro, roughly chopped; Salt to taste; Optional 1-2 tbsp water to adjust consistency