A little anecdote of why I like apple pies. I have a memory of my grandmother baking an apple pie inside an RV... WHILE THE RV WAS IN MOTION. I was probably around 7 years old, and we were driving from Canada, back into the US. The issue being that we had a good number of apples - I think "Granny Smith" apples and we could not cross the border with the raw apples. But there was no restriction on baked apples. The oven ran with LP Gas, so it wasn't affected by the motion of the vehicle, though I still don't know what my grandmother did to keep the pie steady inside the tiny oven!