The grown-up, late-night cousin of the pumpkin spice latte: same seasonal comfort, just a little less innocent. Tip into a blender, lift out the cinnamon, blitz as smooth as possible, then strain into a jar. To build the drink, measure all the liquids into a shaker, add a big handful of ice, then shake hard. Lay a napkin across half the top of the glass, dust the exposed side with cinnamon powder, then lift off the napkin. Balance the cinnamon stick on the other half of the glass (singe one end slightly to release that autumnal scent), then serve.