Wash and peel the sweet potato. Cut into even stripes.
Get a baking tray and cover with a baking sheet. Add the sweet potato and salt and put it into the oven.
Bake for 1 hour, remove from the oven and raise the heat to 200ºC/392.00ºF. Pour over the cooking oil and bake for an additional 20 minutes or until the fries have gotten a nice burnt texture.
When done, put the sweet potato on a plate covered with some paper to let it soak up the oil.