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Cool a martini glass with ice or in fridge
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Limes
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Mint
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Agave or simple syrup
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Muddle 4-5 mint leaves with juice of 1/2 lime
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1/6 oz Chartreuse and simple syrup or agave
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Add plenty of ice
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1½ oz Gin
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Shake
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Filter into chilled glass; add sparkling water and mint for garnish