Coat the bottom of a large saucepan with vegetable oil and add corn kernels. Shake the pot so the kernels lay flat on the bottom of the pan in the oil. Place the pot over a medium-high heat. When the oil starts to crackle, gently shake the pot to rotate the kernels. Do this every 30 seconds until the corn begins to pop. When the popping stops, immediately pour the popcorn into a large bowl and salt to taste. Remove any un-popped kernels and set the bowl aside.