In a large pot on the stove, heat the oil and three popcorn kernels, covered, over medium-high heat.
When the three kernels have popped, remove the pot from the heat and add the remaining popcorn kernels.
Give the pot a little shake to evenly distribute the kernels across the bottom.
Cover the pot and let sit for one minute.
Return the pot to the heat and cook, cocking the lid slightly to allow steam to escape, and shaking the pot occasionally.
When the popping slows considerably, remove the pot from the heat, wait a moment for the popping to stop completely,, and pour the finished popcorn into a large bowl.
Top with desired toppings and enjoy!
Notes
You can use whatever oil you'd like for cooking the popcorn, but make sure it has a high smoke point -- don't use butter though. It will burn.