Lyonnaise Potatoes

Pommes de terre Lyonnaise is a classic French treatment of sautéed sliced potatoes and onions. People often make the mistake of cooking it at too high a temperature, resulting in the outside being excessively browned before the centre is properly cooked; they also fry the potatoes and onions together, when they should be done separately and only combined just before serving.

You can use olive oil, duck or goose fat or lard as a cooking medium; or if you prefer, you could even