Beef Potpie

• 93 ultra beef (lean ground)
• 1 buttermilk biscui
• 240 ml water
• 170 gr mushrooms (sliced)
• 120 gr onion (chopped)
• 65 gr all purpose flour
• 60 ml instant nonfat dry milk
• 16 ml worcestershire sauce
• 5 ml dry mustard
• 2 gr parsley flakes (dried)