Cover the bottom of a good wide frying pan with the oil and bring to the fire until hot. Add the corn kernels, leaving them in a single layer, and cover. Leave a little gap so that the steam comes out.
When the first popcorn starts to sound, lower the temperature to a medium level Wait until explosions stop. Turn off the heat and uncover.
Season with salt to taste, or with butter and sugar if you prefer sweets, while they are still hot, stirring well. When they’ve cooled down a bit, remove any grains that have not burst and some possible scorched popcorn.