Boiled

Ingredients

Remove the papery husks from the tomatillos and rinse to remove the sticky residue.
Quarter the onion.
Add all of the ingredients except the cilantro and salt to a large pot and just cover with water.
Bring the water and ingredients to a boil and then simmer for 10 minutes.
Blend the cooked ingredients and the cilantro with the cooking water until smooth. (About 30 seconds)
Heat 2 tablespoons of cooking oil in the pot.
Pour the blended salsa back into the pot with the hot cooking oil.
Reduce the heat and simmer for 20 minutes.
Add the salt and adjust if necessary.

Too runny? Simmer until it has reduced to the desired consistency.
Too thick? Add water 2 tablespoons at a time until the desired consistency is reached.
Too hot or acidic? Add only one of the following to reduce heat: ½ teaspoon baking soda, 1 to 2 teaspoons sugar, 1 to 2 teaspoons agave syrup.
Like it hot? You do not have to seed the serrano chiles. You can seed them if you want to reduce the heat of the salsa.

Set an oven rack about 6 inches from the heat source and preheat the oven's broiler.
Lay tomatillos, Anaheim peppers, onions, jalapeno peppers, and garlic on a large rimmed baking sheet.
Broil in the preheated oven until tomatillos release their juices, 7 to 10 minutes. Remove tomatillos and garlic from the baking sheet; flip Anaheim peppers, jalapeno peppers, and onions and return to the oven. Continue to broil until peppers are blackened, about 5 minutes more. Remove from the oven and let cool until safe to handle, about 5 minutes.
Peel away blackened parts from vegetables without taking off too much flesh. Transfer tomatillos, Anaheim peppers, onions, jalapeno peppers, garlic, cilantro, lemon juice, and salt to a food processor and pulse until well combined and chopped. Refrigerate salsa until cold, at least 30 minutes.