Yes, boiling…….
Seven ISIS fighters who fled the battlefield are BOILED ALIVE as punishment in Iraq

The terrorists ran away from a conflict in Sharqat in the Salahuddin province and had their hands and feet tightly bound before being thrown into a giant cauldron of boiling water to their deaths. The order was made by Islamic State, just as it was last month when 19 fighters were killed for fleeing a Fallujah battlefield. That time, they faced a firing squad.
That is becauae they are going to eat them.