Lemongrass Sage Vodka Fizz

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