Potato Casserole Au Gratin - cooking recipe

Ingredients
    1 lb potato, peeled and sliced thin
    2 tablespoons butter
    salt
    pepper
    1 lb gruyere or 1 lb white American cheese
    1/2 cup Dijon mustard
    1 yellow onion, thinly sliced
    1 cup white wine
    1 cup fresh breadcrumb
    1/2 cup parmesan cheese
    1/4 cup butter
Preparation
    Cover potatoes with water and boil for 3 minutes; drain.
    Butter a 9x13 baking dish with 2 Tbsp butter.
    Layer half of potatoes, salt and pepper, Gryere and smear with half the mustard.
    Then put a thin layer of onion slices.
    Repeat layers and press down well.
    Pour over 1 cup of white wine.
    Sprinkle with bread crumbs and parmesan.
    Dot with butter and cover with foil.
    Bake 350* for 30-35 minute.
    Uncover and bake 10-15 more minute.

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