For a non-alcoholic version, simply omit the vodka and replace it with additional club soda or sparkling water. Adjust the amount of honey in the syrup to your liking, depending on the tartness of the rhubarb. Experiment with different types of green tea to customize the flavor profile of the punch. Sencha or Dragon Well green teas work particularly well. If you don't have fresh rhubarb, frozen rhubarb can be used instead. Be sure to thaw it completely before chopping. For a festive presentation, consider adding edible flowers to the garnish.