Place the oil, popcorn and salt in a large, 6-quart, metal mixing bowl. Cover with heavy-duty aluminum foil and poke 10 slits in the top with a knife.
Place the bowl over medium heat and shake constantly using a pair of tongs to hold the bowl. Continue shaking until the popcorn finishes popping, approximately 3 minutes.
Remove the bowl from the heat and carefully remove the foil. Stir in any salt that is on the side of the bowl.