When traveling in the Yucatán, Pete Wells discovered that Mexican bartenders make a different, and to his mind, far better version of the gin and tonic than their North American counterparts. Their secret: they use lime as an ingredient, not just a garnish.
1/4 cup gin
1 tablespoon fresh lime juice
Lime slice, for garnish
Fill a highball glass with ice. Add gin and fresh lime juice. Top off the glass with tonic and stir gently. Garnish with a lime slice.