Step 1

Hydrate dried peppers. Place the dried chiles in a medium-sized sauce pot and add just enough water to cover them. Bring the water to a boil, and then cover the pot and and turn off the heat. Let the chiles hydrate in the hot water until they're soft, at least 20 minutes.

Step 2

Prep peppers. Remove the chiles from the pot. Use your hands or a paring knife to gently remove the stems and seeds. Add the hydrated chiles to the blender. (If you're very sensitive to the heat, I suggest wearing cooking gloves.) Remove 1 cup of the hydrating liquid from the pot and pour it in the blender. (Do not throw out remaining liquid as you can use it as a stock in other recipes.)

Step 3

Add remaining ingredients to blender and blend. Add the stock, sugar, garlic, spices, salt and pepper to the blender. Purée in the blender until the mixture is as smooth as possible. Season to taste with salt and sugar if necessary. (Here's how.)

Step 4

Use or store. Stir in the oil and it's ready to use. Or, pour the sauce into a storage container with a tight sealing lid, and place in the refrigerator, where it should keep for at least 3 weeks.