Nutrition per serving may change if servings are adjusted.
1 cup blackberries, fresh or frozen
1 sprig fresh rosemary, plus more for garnish
¼ cup sugar
½ cup water
1½ ounces vodka
½ ounce lime juice, plus lime slice for garnish
2 ounces seltzer
Set a fine-mesh strainer over a heatproof bowl. Muddle blackberries, rosemary and sugar in a small saucepan until almost smooth. Add water and bring to a simmer over medium-high heat. Cook, stirring occasionally, until fragrant and deep purple, about 5 minutes. Strain the mixture into the bowl, pressing on the solids to extract as much juice as possible. Refrigerate until cool, about 30 minutes.
Combine 1 ounce of the syrup, vodka and lime juice in a glass. Add ice and top with seltzer. Garnish with more rosemary and a lime slice, if desired.
To make ahead: Refrigerate syrup (Step 1) for up to 1 week.
125 calories;0 g fat(0 g sat); 1 g fiber; 7 g carbohydrates; 0 g protein; 5 mcg folate; 0 mg cholesterol; 5 g sugars; 0 g added sugars; 35 IU vitamin A; 7 mg vitamin C; 6 mg calcium; 0 mg iron; 1 mg sodium; 39 mg potassium
Carbohydrate Servings: ½
Exchanges: 1 alcohol equivalent, ½ other carbohydrate