- 2 (12-ounce) bags fresh cranberries
- 1 cup sugar
- 1/2 cup water
- 3 1/3 cups chilled tonic water
- 1 1/4 cups gin
- 3 tablespoons plus 1 teaspoon fresh lime juice
- Bring cranberries, sugar, and water to a simmer in a 3- to 3 1/2-quart saucepan, then simmer, uncovered, stirring occasionally, until berries just begin to pop, about 2 minutes. Drain cranberries in a fine-mesh sieve set over a 1-quart glass measuring cup, then reserve 2 cups cranberries and force remaining berries through sieve into syrup. Discard solids remaining in sieve, then add reserved cranberries to syrup. Cool to room temperature. Transfer to a pitcher and chill until cold, about 2 hours.
- Add remaining ingredients to syrup, stirring gently to combine. Serve drinks over ice in 8- to 10-ounce glasses.