Peel, cut, and remove the seeds from the squash.
In a large frying pan, melt 2 Tbsp of the butter. Peel the squash, then lay 1/2 of it in the pan, being careful not to overlap.
Turn heat to medium.
Sprinkle 3 Tbsp dark brown sugar, 1 tsp cinnamon, 1/8 tsp cayenne, 1 tsp salt, and 1 tsp pepper over squash.
Fry until brown on the bottom; turn and brown on the other side.
Squash will get gooey and candied as it cooks.
When the first pan is done, transfer to an oven-safe dish and keep warm at 170° F.
Cook the second batch the same as the first.