ginger

... is that the owners are themselves soleless.

From The Scotsman:

Richard Macrae was given the homemade card for his 30th birthday by a friend as a joke. But when he presented it in shops, bars, restaurants and cinemas, Mr Macrae was surprised to find many retailers agreed to take money off his purchases. "People have always given me stick for my hair colour but now I'm going out three nights a week and saving a fortune. The joke's on them," said Mr Macrae.

1-1/4 – 1-1/2c WHISKEY (Jack or Jameson, if you dare)
HONEY
BROWN SUGAR
2-1/2 – 3in PIECE OF GINGER ROOT
GRANULATED SUGAR
POWDERED VANILLA FLAVORING (coffee flavoring)

Full recipe here.

I mean, I've always suspected that plants didn't have souls.

The ginger, that is! I happen to like my soul!