Do not eat any of it raw or boiled in water, but roasted, its head with its legs and its inner parts.
Exodus 12:9

Why must the #passover lamb be roasted, not boiled? Here's one theory: Boiling causes meat to absorb the water and whatever might be in it. It's not just the lamb anymore. Roasting removes some fat and blood, but introduces nothing to the meat. It leaves nothing but the Lamb itself.