Begin with 2 dried guajillo chilies and 2 dried ancho chilies, pull off their tops and deseed them. Place their skins into a bowl along with 4 to 6 dried oyster mushrooms. Pour 1.5 cups or 350 milliliters of boiling water on top of your chilies and mushrooms, and cover with plastic wrap to let them steep and soften.
Watch out
Remove all seeds and stems completely or the marinade will turn out bitter.






