"Hugue Dufour makes a pork broth for his French onion soup using bacon for smokiness and a pig's foot for richness. Omit the pig's foot for a lighter broth...."
INGREDIENTS
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2 pounds lean slab bacon, in one piece
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1 whole pig's foot or two halves
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8 large yellow onions—1 whole, 7 sliced 1/4 inch thick
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2 gallons of water
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1/4 cup rendered pork fat or vegetable oil
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Salt
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1/2 cup all-purpose flour
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Two 12-ounce bottles brown ale
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6 rosemary sprigs
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Freshly ground pepper
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12 ounces rustic bread, cubed
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6 tablespoons unsalted butter, melted
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6 garlic cloves, peeled
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4 cups shredded Gruyère cheese (about 1/2 pound)