Warm a heatproof mug by filling it with hot water for 2–3 minutes, then empty it. A warm mug keeps the drink hot longer.
Pour the bourbon into the warm mug and add the honey. The honey will settle at the bottom at first.
Add the fresh lemon juice. The citrus aroma should become noticeable right away.
Slowly pour in the hot water, keeping it hot but not boiling. Stir until the honey completely dissolves and the drink looks clear and golden.
Add the lemon slice and cinnamon stick. If using star anise, drop it into the mug for extra spice.
Let the drink sit for about 1 minute so the spices release their flavor. Serve immediately while hot.