Shave the stems of the broccoli and cauliflower with a box grater.
Chop the top half of the leek.
Heat the oil in a medium frying pan until shimmering], then add the broccoli, cauliflower, leeks, salt, and pepper. Cook the vegetables for 5 minutes until tender.
Serve over salad, on bagels, or mixed in with any base you like.