Serrano Paste - cooking recipe

Ingredients

10 serrano peppers, whole
1 small white onion, finely chopped
1 clove garlic, pressed (not head)
1 teaspoon salt
water (a little)

Preparation

Cook the Serranos in a cast iron skillet on high heat or under the oven broiler until the skin is brown on the outside, turning occasionally, but do not burn.
(Beware the fumes) Add the rest of the ingredients and grind in a mortar and pestle (or use food processor) until it is thick and pasty.
Use water to bring to spreadable, pasty consistency.
Enjoy on tacos, or add to soups.