To make marinade, mix first 6 ingredients and thoroughly mix with the beef. Let stand for at least 1 hour, preferably overnight, refrigerated. In a hot pan or wok, coat with Canola oil and add leeks, garlic and ginger. Stir for 3 minutes to caramelize. Add drained beef and stir for 2 minutes. Add asparagus and heat thoroughly. Check for seasoning. Serve immediately with starch of choice. For me, that means rice.