"[Photographs: Joshua Bousel] About the author: Joshua Bousel brings you new, tasty condiment every other Wednesday and a recipe for weekend grilling every other Friday. He also writes about grilling and barbecue on his blog The Meatwave whenever he can be pulled away from his grill...."
INGREDIENTS
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1/2 pound Swiss cheese, grated
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1/2 pound Gruyere cheese, grated
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1 tablespoon cornstarch
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3 tablespoons butter
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2 large yellow onions, diced medium
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10 ounces evaporated milk
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2 teaspoons Worcestershire sauce
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1 tablespoon finely chopped fresh thyme leaves
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Kosher salt and freshly ground black pepper