Lavender-Cucumber Gin & Tonic

To prepare simple syrup: Combine sugar and water in a small saucepan. Bring to a boil over high heat. Cook, stirring, until the sugar is dissolved, about 1 minute. Remove from heat. Stir in flowers and let cool to room temperature, about 45 minutes. Strain (discard the flowers) and refrigerate for up to 1 month. (Makes 1-1 1/4 cups.)

To prepare gin & tonic: Fill a tall glass with ice. With a muddler, mash cucumber in the bottom of a cocktail shaker. Add gin and 1 ounce of the simple syrup. Shake for 10 seconds. Strain into the glass and add tonic. Stir to combine. Garnish with cucumber slice, if desired.