Step 1
Combine broth, soy sauce, sherry, ginger and onions in medium saucepan or fondue pot. Bring to boil on medium-high heat. Reduce heat to medium-low; simmer 15 min. Meanwhile, mix mayonnaise and dressing; set aside. Cut steak into 1/8-inch-thick slices and mushrooms into 1/4-inch-thick slices. Arrange on platter.