Combine all items in order. If using Soda Stream or similar, make seltzer water extra fizzy. Mix. Serve as is, or with mint on ice.
*note about Ginger Green Tea Syrup. Brew green tea, add slices of fresh ginger to taste, and let steep for a few hours. Remove tea/bags. Add enough sugar for simple syrup or thicker as you desire. Heat to dissolve sugar. Store in fridge and use in drinks, on pound cake, or in morning yogurt.