INGREDIENTS
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2 cups whipping cream
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4 crushed garlic cloves
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3 peppercorns
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3/4 teaspoons sea salt
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1 tablespoon oil
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1 large Spanish or yellow onion, thinly sliced
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3 large Yukon Gold potatoes (2 to 3 pounds), peeled
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1 cup shredded Gruyere cheese
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2 sprigs fresh thyme