Frederick maintained the boiling oil over the entryway at the Duke’s castle. But he used the finest cooking oil of the kingdom, and he had a side business of making skewers of tempura, vegetables and chicken. It was quite the lucrative venture. On Thanksgiving, he would deep fry turkeys. The Duke really enjoyed deep fried turkey, and he gave Frederick a promotion. Frederick‘s assistant, then took over the oil duties, but the next Thanksgiving he forgot to thaw the turkey and when they were dropped in to the cauldron, the ice flashed to steam and scalded everyone in the tower.