Beef Stroganoff Ii

• 24 onions
• 3 crme frache
• 1 demiglace
• 1,400 gr beef tips
• 160 gr mushrooms
• 140 gr butter
• 50 gr tomato paste
• 45 ml worcestershire sauce
• 45 gr butter in a sized skillet
• 28 gr butter in the same skillet