Peppermint. Does herbal tea get any simpler than this? I usually associate that whistle-cool feeling of peppermint with Christmas, candy canes, toothpaste, and breath mints, but it also makes for a pretty calming tea with loads of health benefits.
I picked this up from Adagio, but any number of tea vendors sell peppermint. It’s also a great staple tea for those of you into making your own tea blends!