A Summer Time BBQ
Jesus presented discipleship in the starkest terms. Munch, chew, or gnaw on his flesh. While this thought might seem grotesque, his point remained valid. To gnaw on food (like a good pork or beef rib) requires commitment. In spite of the mess. In spite of the rude behavior of the one eating.
To make the point, have a summer-time BBQ of ribs. (Make sure you pour the sauce on thick!) During the meal, while everyone gnawing on a good rib, read John 6:53-56. Point out the word "to eat" is literally "to gnaw" or "to chew on." Also point out that feeding upon Jesus is like eating a good rib. It's serious work that requires a commitment. But it's very satisfying.