This is a test of commonsense. Complete the next sentence:

How to prepare and cook cardoons
Look for cardoons in a farmers market or a specialty grocery store.
They are likely to be more readily available where growers specialize in a wide variety of heirloom vegetables. They should be readily available in quality vegetable markets in britain and southern european countries from late winter into early summer; they are prized in some italian and french dishes.
If available in the us, look for cardoons in may, june and july. Choose cardoons that look fresh and plump.