Place the sugar cube (or 1/2 teaspoon loose sugar) in an Old-Fashioned glass. Wet it down with 2 or 3 dashes of Angostura bitters and a short splash of water or club soda. Crush the sugar with a wooden muddler, chopstick, strong spoon, lipstick, cartridge case, whatever. Rotate the glass so that the sugar grains and bitters give it a lining. Add a large ice cube. Pour in the rye (or bourbon). Serve with a stirring rod. Garnish with strips of orange zest.
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