Method

Peel the potatoes and cut into slices about 7mm thick
Boil the potatoes in salted water for 10 minutes, then drain
Dice the onion finely
Place a layer potatoes in a 3 litre baking dish
Sprinkle some of onion, crushed garlic and freshly ground pepper over the potato layer
Cover with a layer of Creme Fraiche and then a layer of Cheese
Repeat with more layers until all the potato is used
Cover with foil and Bake for 45 minutes in a per-heated oven 170c
Remove the foil for the last 20 minutes of cooking