Soak mushrooms in 1 cup hot water for 20 minutes until soft. Drain well, remove and discard stems. Cut caps into thin strips.
Cut beef lengthwise into strips.
Combine marinade ingredients in large bowl.
Add beef, toss.
Refrigerate 20 minutes.
Drain beef. Heat large skillet, add 1/2 of the beef and stir fry for 1-2 min, careful not to overcook. Remove. Repeat with remaining beef. Combine beef, mushrooms, coleslaw mix, green onions and cornstarch mixture in skillet. Cook and stir until sauce is thickened.
Spread hoisin sauce on tortilla, spoon beef mixture down center.