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REC: Potato, Leek, Gruy

These are quite rich, but are a great special occasion dish.

Potato, Leek, Gruyère and Oyster Mushroom Gratin
Bon Appétit | November 1998

Yield: Serves 10
ingredients

4 tablespoons (1/2 stick) butter
1 pound oyster mushrooms, halved if large
1 tablespoon minced garlic
4 cups thinly sliced leeks (white and pale green parts only; about 4 large)
1 tablespoon minced fresh thyme
1 3/4 cups canned low-salt chicken broth
1 3/4 cups whipping cream
1/4 cup dry white wine
1 teaspoon salt
1/2 teaspoon ground black pepper
3 3/4 pounds russet potatoes, peeled, thinly sliced into rounds (about 8 cups)
2 1/2 cups grated Gruyère cheese (about 10 ounces)

preparation

Melt 2 tablespoons butter in heavy large skillet over medium-high heat. Add mushrooms and sauté until almost tender, about 5 minutes. Add garlic and sauté until mushrooms are tender and golden, about 3 minutes longer. Transfer mushroom mixture to bowl. Melt remaining 2 tablespoons butter in same skillet over medium-high heat. Add leeks and thyme and sauté until leeks are tender and beginning to brown, about 8 minutes. Add leek mixture to bowl with mushrooms. (Can be made 1 day ahead. Cover and refrigerate.)

Preheat oven to 400°F. Butter 13 x 9 x 2-inch baking dish. Whisk broth, cream, wine, 1 teaspoon salt and 1/2 teaspoon pepper in large bowl to blend. Layer 1/3 of potatoes on bottom of prepared dish. Top with half of mushroom-leek mixture, then 3/4 cup cheese. Top with half of remaining potatoes. Pour half of cream mixture over. Top with remaining mushroom-leek mixture and 3/4 cup cheese. Cover with remaining potatoes. Pour remaining cream mixture over; sprinkle with remaining cheese.

Bake gratin uncovered until potatoes are tender and sauce bubbles thickly, about 1 hour 20 minutes. Let gratin stand 30 minutes before serving.

http://www.eat.at/swap/forum/index.php?action=display&forumid=1&msgid=163636

 
weight of six medium potatoes?

I'd really like to try this recipe - sounds perfect for a make-ahead Christmas potato recipe......but find it easier to work in weights so that the proportions of potatoes to sauce have a better chance of being right. Anybody have an idea of what kind of weight we're talking about for six medium potatoes? 2 pounds?
thanks, Bonnie

edited to add: I was out in the woods, walking the dog, and suddenly realized...hey, I can google that! The goggle results are all over the place, from 150 gms (5 oz) to over 200 gms for one medium potato. If I use the low end of 150 gms, 6 medium potatoes would be 900 gms, which is just about a kilo (2.2 lbs). So I guess I'll go with a kilo of potatoes for this.
cheerio, Bon

 
Bonnie, I have some "normal" non-mutant size organic russets

They are "fist sized" which is how my old cookbooks described potatoes.

I weighed two similar-looking potatoes on my scale and each came in about 150 grams or ~5 oz.

It looks like the Google answer was spot on.

 
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