Arugula is a leafy green vegetable that has a peppery taste to it!!
To quote Obama.
“Barack Obama posed a question at an Iowa rally: “Anybody gone into Whole Foods lately and see what they charge for arugula? I mean, they’re charging a lot of money for this stuff.” There were no Whole Foods stores in Iowa at the time — and besides, why wasn’t he eating iceberg or romaine like a Real American, anyway?”
And Arugula grows like a weed so paying for it is silly. At least during the growing season.
Depending on your particular climate/soil etc. it might even be considered invasive. Pretty easy to cull though.