Potato Gratin Dauphinois

Just as every Provençal cook has his or her own way of preparing bouillabaisse, so will every Dauphiné home cook have his or her version of this most famous of all French potato gratins. On the website www.gratindauphinois.com, there are more than two hundred recipes deemed acceptable to the residents of the Rhône-Alpes region of France where Dauphiné is located.

In my version, thinly sliced potatoes are bathed in an egg-enriched cream a