Gratin Dauphinois

• 500 grams (1 pound, 1½ ounces) russet potatoes
• 250

Prepare your mise en place.

Preheat the oven to 191°C (375°F).

Using a vegetable peeler, peel the potatoes. Place in a bowl with cold water to cover.

Using a mandoline, cut the potatoes into 2-to-3-millimeter (1/16-to-⅛-inch)–thick slices. Do not rinse th