This peppery green is known and loved in the UK and Australia as rocket.
In Italian cuisine, it's called rucola. According to the Gourmet Sleuth, this tangy green is also known as roquette, rucola, and rugula. It's easy to grow, and can be used in place of basil to make pesto.
Like most greens, it's nutritious and delicious. Rocket belongs to the brassica family, along with turnips, cauliflower, and broccoli. This plant group is considered useful in combating cancer.
Arugula-rucola-rocket is native to the Mediterranean region, and grows wild from Portugal and Morocco to Turkey.