One of their great debates was on “butter” and “lard” and which product worked best in pie crust.
They came to this conclusion. “Lard makes an excellent fat for a pie crust. Butter is
superior in flavor in most doughs and crusts, but it is a harder fat to work with. It melts quickly, and if not handled correctly, can create a chewy crust rather than flaky. If baked to perfection, butter-based crusts almost always win out.” There is a TV show on both of them baking a pie together and an argument on butter and lard which is sure to make you laugh if you can find it.