From Fisheaters (emphasis mine):
Aside from the Easter eggs and Easter bread, the most traditional Easter foods are those made with all the things once forbidden or restricted during Lent (meats, butter, etc.), but the Easter food of all Easter foods is, of course, lamb, in honor of the Paschal lambs slain by the Israelites and whose blood was painted over their doors so death would pass them by, all prefiguring the Lamb of God Who takes away the sins of the world.
ROFL OH you thought I meant they only eat ham? Ham is still on the menu.