Step 1

In a saucepan, bring the water to a boil. Add the pepper and tomatillos, simmer, uncovered, for 12-15 minutes.

Step 2

Drain, reserving 1/4 cup water of the liquid.

Step 3

In a blender, puree the peppers, tomatillos, garlic and chopped onion, the cilantro if using, then add the reserved liquid if needed to get a saucier texture.

Step 4

Transfer to a bowl and add salt to taste.