"This outrageously good macaroni and cheese fuses two classic comfort foods into one dish Caramelizing onions can be a time-consuming affair, but here, the process is sped up by using high heat and and a little water to prevent scorching The sauce is made with a combination of Gruyère, to remind you of French onion soup, and white Cheddar, to make it melty and smooth..."
INGREDIENTS
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Kosher salt
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4
tablespoons unsalted butter, plus more for greasing the pan
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2
pounds yellow or Vidalia onions, peeled, halved and thinly sliced
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5
sprigs fresh thyme, plus more thyme leaves for garnish
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1
fresh or dried bay leaf (optional)
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Black pepper
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1
pound cavatappi or elbow pasta
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1
baguette, cut into 1/2-inch slices
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1
garlic clove
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2
tablespoons sherry vinegar, red wine vinegar or white wine vinegar
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3
tablespoons all-purpose flour
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4
cups whole milk
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16
ounces Gruyère, grated (about 5 cups)
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12
ounces white Cheddar, grated (about 4 cups)