Roast Veggies. Heat broiler to high. Place tomatillos, onion, garlic, and serranos on a baking sheet. Broil until charred and beginning to soften. The garlic will start to char first, so remove it before it burns.

Keep broiling and turning the veggies every couple of minutes until nicely roasted, about 6-10 minutes total.

Blend. Remove stems from the serrano chiles and place charred veggies in a blender with the Hatch chiles, cilantro, water, and salt.

Blend until completley smooth.

Enjoy! Taste and add more salt if needed then use immediately or keep in a tightly sealed container in the refrigerator for up to a week.