INGREDIENTS
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12 white sugar cubes
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8 ounces club soda, divided
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6 ounces Tanqueray gin
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2 ounces Cappelletti, or other similar bitter apertif
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2 ounces grapefruit juice
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2 ounces lemon juice
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4 dashes Peychaudâ??s bitters
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Grapefruit slices for garnish