"Alex Day of New York's Nitecap combines dry vermouth with Suze and St. Germain to make the perfect batchable cocktail for the summer...."
INGREDIENTS
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4 cups dry vermouth, preferably Dolin
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1½ cups Suze
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1 cup St. Germain
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1 cup fresh lemon juice
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½ cup simple syrup (1 part sugar to 1 part water, boiled until sugar dissolves)
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Ice
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2 cups seltzer water
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Grapefruit slices, for garnish