Spiced Apple Fizz

Name: Spiced Apple Fizz
Ingredients: For the spiced apple syrup:; 1 1/2 cups turbinado or raw sugar; 1 1/2 cups apple juice; 1 cinnamon stick; 2 whole cloves; 1 (1-inch) piece of fresh ginger, peeled; Zest of 1 lemon; For the fizz:; 2 ounces gin or Seedlip Spice 94; 1/2 ounce spiced apple syrup; 1/2 ounce lemon juice; 2 dashes walnut bitters; 1 ounce club soda; Thinly sliced apple or lemon twist (optional, for garnish)