I cannot use oyster sauce because of my son's allergies to fish and nuts. Is there something else you might reccommend I use. I also have not found a sesame oil that does not list (may contain peanuts or manufactured in a plant with peanuts) on the ingredient list so that is not an option. We have to be careful with aisian food but we definitely have to cook it at home he cannot eat in an asian restaurant. Any suggestions?