Using ingredient stick of the butter in skillet over low heat

Beef Stroganoff Iv

• 1 stick
• 5/8 stick of the butter in skillet over low heat
• 1,400 gr beef tenderloin
• 240 gr beef consomme
• 475 ml sour cream
• 120 ml dry wine (white)
• 110 gr butter
• 80 gr mushrooms
• 65 gr all purpose flour
• 6 gr salt