This extraordinary twist on the traditional gimlet includes fresh basil and celery bitters. A long-lost type of bitters from the 19th century that has made a comeback in recent years, celery bitters are especially delicious in gin and vodka cocktails.
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5 basil leaves, plus 1 small basil sprig for garnish
1 ounce fresh lime juice
2 1/4 ounces London dry gin, such as Martin Miller's