I've picked it because the bulk of my vege patch this year turned into a herb patch. They are (almost) indestructible, zero maintenance and yet you can still say things like "oh yes, I keep a plot for growing my own" or "it tastes so much better coming straight from the ground" at dinner parties and your nose not hit the person over the other side of the table. (Although they may hit your nose for saying it!).
This is it: