Jewish Challah Bread
Our family uses this for our weekly Sabbath celebrations, and we use it to discuss the Trinity, but also how Christ is the "Bread of Life". An interesting fact: Bethelehem was perhaps where the Shewbread for the temple was baked, and is literally "City of Bread" (beth-city; lehem-bread). Jesus said he is the Bread from Heaven -John 6:32-33, 58. Grace Communion International - specific link had gone dead.
The Jewish Challah bread is three-strand braided bread that is then twisted into a circle and baked, forming one bread. (Poppy seeds or sesame seeds are added to remember Manna from heaven) The Middle-age traditional bread symbolizes the Trinity, for Christians. For a Cooking lesson, you could make little braided loaves like that.
Interesting fact: The Matzah bread, used in the Passover, are three separate unleavened loaves together, yet during the ceremony, the middle one is 'hidden' in the house and the kids have to find it. This also symbolizes Christ who was 'missing' between his death and resurrection.
http://www.myjewishlearning.co.../Hidden_Matzah.shtml (this site also explains the Jewish traditions regarding Challah bread)