Beef Pot Roast

• 6 carrots (cut into)
• 3 potatoes quartered
• 2 onions (sliced)
• 2 bay leaves
• 1,500 ml sour cream
• 1,400 gr brisket of beef uniformly shaped (boneless)
• 80 ml olive oil
• 65 gr tomato paste
• 30 ml lemon juice
• 30 gr prepared horseradish