Hi, I am new to chowhound. I have several pieces of Le Creuset, but recently bought one at a garage sale. It is a large oval with 43 stamped on the bottom. Unfortunately, it was missing the lid. It has the black interior. I was told it was bought at Williams Sonoma and she thought it was a roaster. Does anyone know exactly what this is? I can not find it anywhere on the web. It is shorter then the oval french ovens I have seen. It is about 17 inches by 13.2 by 4 1/2 inches high. Also, how do I clean the black interior? My other pieces have the sandy interior. I would really appreciate anyone's help, thanks so much.