Texas Barbequed Beef Brisket

• 9 disposable foil (pan)
• 1 beef brisket (boneless)
• 1 onion
• 350 ml catsup
• 350 ml water
• 230 gr drippings
• 16 ml lemon juice (fresh)
• 16 ml worcestershire sauce
• 14 gr butter
• 5 gr paprika