While I couldn't resist the dirt pudding lesson for Joseph, I wouldn't want to do that every time.
If there are people with particular food interests, maybe you could invite them in to help. (If you felt they could give a positive message without condemning "inferior" foods.) One of our food people is a grandmother type that has never taught, but wanted to do something with food and kids, so I kept my eyes open for a lesson that would work for her. When we got to the baptism of Jesus, I suggested she do a lesson on John the Baptist: "locusts and wild honey". As I was talking to her on the phone, she pulled from her shelves a book on "101 ways to cook a grasshopper" (not the actual title, but something like that.) Now how many people could do that? She came to class each week wearing a t-shirt that said "I ate bugs" from an insect themed dinner held a while back at a local nature center. It just was one of those things that was destined to be.