Just break off a 2 - inch branch of a fresh herb (basil, thyme, mint, or rosemary are especially good here), a couple strips of citrus zest (removed with a vegetable peeler), or whole sweet spices (like cardamom, cinnamon, or clove) into your mug. (epicurious.com)
A simple tisane made from a couple strips of lemon zest is pretty delicious all on its own, but you'll also want to start experimenting to make combinations. (epicurious.com)