INGREDIENTS
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4 tbsp. unsalted butter
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3 large white onions, thinly sliced into half moons
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kosher salt
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Black pepper
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1/2 c. white wine
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2 c. chicken stock
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4 c. beef stock
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8 sprigs fresh thyme, plus more for garnish
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4 Baguette slices
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2 c. shredded Gruyere cheese
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