Lemongrass Sage Vodka Fizz

Name: Lemongrass Sage Vodka Fizz
Total time: 45 min
Yield: 2 servings
Ingredients: 4 stalks lemongrass chopped into 1 inch pieces -; 1 1/2 cups granulated sugar; 1 1/2 cups cold water; 2 1/2 tablespoons lemongrass syrup; 1/2 lemon sliced -; 4 sage leaves; 2 ounces vodka; ice; seltzer