Beef Montparnasse

• 6 onions (white)
• 6 potatoes (new peeled)
• 1 bay leaf
• 525 gr round steak in serv
• 120 ml dry wine (white)
• 32 gr cans mushrooms with liquid
• 24 gr shortening
• 6 gr salt
• 2 gr parsley (minced)
• 1 gr pepper