Veal And White Asparagus Fricassee

• 2 bay leaves
• 1 onion (sliced)
• 1 few peppercorns (crushed)
• 1 dah lemon juice
• 950 ml water
• 400 gr veal in
• 270 gr asparagus (white)
• 110 gr butter
• 60 gr mushrooms (fresh sliced)
• 28 gr butter