INGREDIENTS
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2 medium onions, finely chopped
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1 tablespoon unsalted butter
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1 tablespoon Calvados, Applejack, or other brandy
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4 cups low-salt beef stock
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Kosher salt and freshly ground black pepper
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48 1/2"-thick slices baguette, cut to fit ramekins
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1 cup grated Gruyère or raclette cheese