INGREDIENTS
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2 tablespoons unsalted butter
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2 Vidalia onions, sliced into 1/4-inch-thick rings
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2 large shallots, sliced into 1/8-inch-thick rings
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3 cloves garlic, minced
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2 cups sour cream
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1 cup mayonnaise
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1 teaspoon celery salt
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1 teaspoon Worcestershire sauce
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Kosher salt and freshly ground pepper
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Chives, finely chopped, for garnish
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Potato chips, for serving