Seasonal Margarita

Name: Seasonal Margarita
Yield: 1
Ingredients: 1 lime, cut into 8 pieces and muddled with 1 tablespoon Simple Syrup; 3 ounces añejo tequila; 1 tablespoon mango liqueur; 2 tablespoons guava nectar; 1/4 cup chilled ginger beer; Ice; Mango slice, for garnish