wash the potatoes, put them in a pot with cold water and cook them for about 25 minutes: they must be almost cooked to perfection, but still a little behind cooking.
let them just cool, then peel them and cut into slices.
While the potatoes are cooking, cut the fior di latte and put it to drain in a colander.
Grease a pan with a little oil, place half of the slices and then season with mozzarella, salt and pepper.
Create a second layer of potatoes, season with salt and Parmesan and cook for 20 minutes at 180 ° C in a preheated ventilated oven.
If necessary, turn on the grill in the last 5 minutes.
The stringers are ready: serve them immediately, very hot, to keep the stringy effect!
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