In a medium saucepan, melt the butter in the oil. Stir in the popcorn kernels.
Adjust popcorn quantity so that a single layer of popcorn kernels cover the bottom of the pan.
When the popcorn is heated, pour the sugar over all and cover with a tight lid.
Turn up the heat and stay by the pan, shaking it back and forth over the burner. The kernels should begin to pop - when they do, turn the heat down after a minute. Continue shaking the pan another minute or two and remove from heat.
Stir in a pat of butter and a pinch of salt and serve.
