While this recipe uses many specific ingredients, use the basic sugar-water-acid ratio of 1 cup to 1 cup to 3 tablespoons to create a syrup with your own herb blend specific to your tastes. Other citrus or even vinegar can be substituted for the acid. Ginger, cinnamon, star anise, cardamom, and clove are other classic spices to experiment with as substitutions. Though you might simply poke around your spice cabinet: chaga, tarragon, rosemary, oregano, sumac, and mint would also add distinctive flair.