Use a mortar and pestle to crush the hibiscus flowers to a size similar to the other ingredients, if needed.
Use a mortar and pestle to crush/bruise the Fennel Seeds and Peppercorns.
Using a tea envelope, an infuser, or nothing add all of the ingredients to the desired pitcher.
Fill the picture with cold water, and allow to cold-brew in the refrigerator for 8-24 hours.
Remove from the refrigerator and strain out the ingredients. Give the pitcher a stir before pouring.