A cocktail that appears perfectly clear until the rim of the glass is tapped, when it blooms into swirling orange, prepared by Data for Deanna Troi to settle a chess wager.
The Samarian sunset is a drink made in the traditional style, poured clear and transformed into a glowing sunset of orange and gold by a sharp tap on the glass.
It appears in the Next Generation episode Conundrum. Troi defeats Data at three-dimensional chess, and the stake of their wager is that he must make her a Samarian sunset. He prepares it at the bar in Ten Forward with some ceremony and she taps the glass to bring out the colour.
The moment has an odd consequence. When the crew's memories are wiped shortly afterwards by an alien scan, Data is standing behind the bar, and for a time everyone, Data included, assumes that he must be the ship's bartender.