Borage

It has to be one of the oddest sensations I've had. It's both tasty and prickly. The best way I have found to describe it is a cross between watermelon and cucumber, very light and refreshing. I haven't planted it this year but had a good crop of it some years back. I wasn't very worried about the water used at the time since I didn't really have to pay for it but I used a lot. That's also the year of the super abundant carrots and the flowering aloe.
The flowers are also edible and my wife decided to freeze them in ice cubes for a party she was having. They looked pretty until the ice melted and there were flowers floating in glasses of water here and there.