Leek scapes are long, slender green stalks, with light green or yellow bulbs near the end with tips that taper to a point. The scapes are harvested once the flower pods have developed and while the stems are still pliable and tender.
Scapes chopped into small pieces are great substitutes for finely chopped onion. They can be a little tough, so if you're using them in something like a quiche, give them a quick sauté first. You can chop scapes into larger pieces, about an inch, to use in stir fries, curries, pasta, and casseroles. If you’d like to really feature the scapes, try coating them in a little oil and roasting or grilling until tender, or cook and purée them into a scape pesto.