Heat oil in medium saucepan with a couple popcorn kernels in it. When they pop, add the rest of the popcorn, sugar, and salt. Cooking, shaking occasionally, until most of the kernels have popped.
Note: Last time I tried just sprinkling with salt at the end. It didn't disperse evenly and wasn't enough. Next time I would add the salt with the sugar. Maybe try 1/8 tsp?