Paprika Beef Roll

• 6 mushrooms (whole)
• 3 onions (whole)
• 2 round steaks see note
• 1 egg
• 240 ml wine (red)
• 110 gr melted butter
• 55 gr butter
• 40 gr mushrooms (sliced)
• 16 ml boiling water
• 1 slice onion (sliced)