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Super delicious side dish for most any meal, best at Thanksgiving. The cheese , onion and slow cooking make it tender and rich.
2 cups whipping cream or milk (for lighter version)
6 crushed garlic cloves
6 peppercorns
3/4 teaspoon sea salt
1 tablespoon oil
2 large Spanish or yellow onion, thinly sliced
3 large Yukon Gold or Russett potatoes (2 to 3 pounds), peeled
1 cup shredded Gruyere cheese
2 large sprigs fresh thyme
In saucepan, bring cream, garlic, peppercorns, thyme, and salt to just under boil; reduce heat to low, cover and simmer for 15 minutes. Remove from heat; set aside.
Heat your oven to 300° F.
Meanwhile, in skillet, heat oil over medium-low heat and cook onion, stirring often, until light brown, about 45 minutes. Slice potatoes as thinly as possible (using a mandoline if available).
Layer 1/4 of the potatoes in greased about 8 x 12-inch glass baking or casserole dish; top with 1/3 of the onion and 1/4 of the cheese. Repeat twice. Top with remaining potatoes. Strain cream mixture over potatoes, shaking casserole to distribute evenly. Sprinkle with remaining cheese.
Bake in 300° F oven on a baking sheet (to catch drips) until tender and a knife inserted into the dish pierces potatoes easily, 1 1/2 to 2 hours. (Make-ahead: Let cool, then cover and refrigerate for up to 2 days. Reheat, tented with tin foil, in 375° F oven for 30 minutes.)
Tip: For a lighter version, steep garlic, peppercorns, thyme, and salt in 2 cups of milk. Then make béchamel sauce: In saucepan, melt 2 tablespoons butter over medium-low heat. Add 2 tablespoons all-purpose flour. Cook, stirring, for 1 minute. Whisk in strained milk mixture, and simmer everything for 5 minutes until slightly thickened. Pour over potatoes.
Adapted from Food52 Recipe
Urban Cowgill 2016 (updated 2024)