Heat 2 tablespoons oil in a large saucepan over high heat. Add 3 popcorn kernels to the oil and cover saucepan with a lid. Once the 3 kernels have popped, the oil is ready. Add the remaining popcorn, cover saucepan, and cook popcorn, shaking saucepan constantly, until you no longer hear popping. Remove saucepan from heat.