Lemon Ginger Beef

• 1 lemon ginger sauce
• 1 onion
• 500 gr green beans (cut)
• 190 gr flank steak
• 85 gr mushrooms (sliced fresh)
• 30 ml honey
• 30 ml dry sherry
• 30 ml peanut oil
• 16 ml lemon juice (fresh)
• 8 gr cornstarch