Bourbon, lemon, and egg white with a red wine float — the two-tone whiskey cocktail that stops conversations.
The New York Sour dates to the 1880s in Chicago (where it was first called the Continental Sour), though the 'New York' name came later. It's a Whiskey Sour with a dramatic red wine float — a technique that requires patience and a steady hand but produces one of the most visually striking drinks in the cocktail canon.
The float works because wine is lighter than the egg white foam below it. Pour too fast or from too high and the wine sinks and mixes. Pour slowly over the back of a bar spoon and it sits as a distinct layer. Choose a dry, medium-bodied red — not too tannic (which fights the sweetness) and not too light (which disappears).
Use rye whiskey instead of bourbon. The pepper and spice of rye is a more assertive partner for the wine's tannin.
Use a full-bodied dry rosé instead of red wine for a pink float. More delicate and slightly less dramatic, but beautiful.
Replace the wine float with a tawny port. Sweeter, richer, and the nutty port notes work unexpectedly well with the lemon sour.