Peel and wash the potatoes and first cut them into slices about 1.5 cm thick. Then cut the slices lengthwise into about 1.5 cm thick sticks.
Immediately place the potato pegs in a bowl of cold water and leave them there for about 15 minutes. Then dab the potato pegs very well dry.
Heat the oil or frying fat in a deep fryer or in a wide high pot to approx. 140 °C.
Add 5-6 portions of potatoes to the hot oil with a skimmer and pre-fry for about 3 minutes each. This makes the fries nice and crispy on the outside and soft on the inside.
Fish it out again with a skimmer, let it drain and put it on kitchen paper. Leave to cool for about 15 minutes. Remove the pot of oil from the stove.
Now heat the frying oil to approx. 170 °C. Fry the French fries a second time in portions for 2-3 minutes until crispy golden brown. Lift out with a skimmer. Let it drip off on kitchen paper.
Pour the fries into a bowl. Sprinkle with fine sea salt and shake gently.