Well actually big H, it comes from a old alfred hitchcock story I saw awhile back. The lady in question bonked her nasty nagging husband on the head, with the sunday frozen leg of lamb. Than she proceeded to roast the murder weapon. When the detectives arrived, they were sure it was foul play, but could not figure out what she used for a weapon. She was very nice and polite to them, and when they commented on the wonderful smell of the leg of lamb roasting in the oven, she invited them to sit down to dinner. They did! and chowed down the murder weapon.