"This thirst-quenching cocktail was said to be created by a bartender from Chihuahua, Mexico, in the 1940s...."
INGREDIENTS
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Coarse salt, (optional)
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4 ounces tequila, divided
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2 ounces orange-flavored liqueur, such as Cointreau, divided
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3 cups grapefruit juice, divided
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4 grapefruit slices, for garnish