In a pot or deep fryer, heat the oil to about 160°C.

Fry the potatoes in batches for about 4-5 minutes until they are soft but not yet brown. This is the first cooking phase, where the fries are cooked through.
Remove the fries from the oil and drain on a kitchen paper.
Second frying phase:

Heat the oil to about 180-190°C.
Now fry the fries for 2-3 minutes until they are golden brown and crispy.
Drain again on kitchen paper.
Seasoning:

Immediately after frying, sprinkle the fries with salt and optional seasonings.
Tips:
For even more crispiness, you can coat the fries in a little cornstarch before the first frying phase.
If you don’t have a deep fryer, you can also fry the fries in a deep pan.
Enjoy the fries hot, for example with ketchup, mayonnaise or another favorite sauce!