Home Uncategorized DIY Rootbeer Recipe. Youll need to track down a couple of obscure tree barks, but the actual brewing process is simplejust a little boiling and waiting. Aside from being fun to say, sassafras and sarsaparilla are the roots that have the flavor we typically associate with root beer, but theres also a whole cast of roots, spices, and herbs that make up this bubbly treat. No two recipes are alike, but other common ingredients include licorice root, vanilla, star anise, and wintergreen.