"This is what we've be training for...."
INGREDIENTS
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1 lb. fettuccine
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6 tbsp. butter, divided
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2 large yellow onions, thinly sliced
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1/4 c. white wine
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4 cloves garlic, minced
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4 tbsp. all-purpose flour
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2 c. heavy cream
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2 c. milk
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1/2 c. freshly grated Parmesan
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1 tsp. fresh thyme leaves
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Kosher salt
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Freshly ground black pepper
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Pinch crushed red pepper flakes
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2 1/2 c. shredded Gruyère, divided
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1 baguette, thinly sliced