Cossack Roast

• 2902 yields
• 5 onions
• 4 tbls yogurt (plain)
• 4 carrots
• 2 turnips
• 2 tbls butter
• 1 1/2 tbls salt
• 1 clove garlic
• 1/2 marinade
• 2,300 gr beef roast (boneless)