INGREDIENTS
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1Tbs. unsalted butter
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1/2 small yellow onion, minced (about 1/3 cup)
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1 large clove garlic, minced
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12 oz. Emmentaler cheese, coarsely grated (about 3 lightly packed cups)
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8 oz. extra-sharp white Cheddar, coarsely grated (about 2 lightly packed cups)
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4 oz. Gruyère, coarsely grated (about 1 lightly packed cup)
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2 Tbs. cornstarch
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1 tsp. dry mustard (such as Coleman’s)
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1/2 tsp. freshly ground black pepper
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1 tsp. caraway seeds, coarsely ground in a spice grinder or with a mortar and pestle
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1-12-oz. can lager-style beer, preferably Budweiser
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3 Tbs. Amontillado sherry
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Kosher salt