Remove the roots from the leek and remove any withered leaves. Halve lengthways, wash well under cold running water and cut into fine strips. Heat a little oil in a pan and fry the leek in it, add the diced ham and fry briefly. Let the ham and leek mixture cool down.
In the meantime, roll out the dough on a baking sheet and preheat the oven to 200 ° C. When the ham and leek mixture has cooled, mix with the crème fraîche and cheese and season with salt and pepper.
Then distribute the mixture on the dough, leaving some space on the edge and bake for about 10-15 minutes.