Four leeks (trimmed, washed and julienned), 16 slices of Parma ham, sesame seeds, 50g of butter (melted), olive oil, 400g of filo pastry sheets.
Blanch the leeks for a minute, then drain them and put them to one side to cool. Handle one sheet of pastry at a time while keeping the others covered with a damp cloth, to prevent them drying out. Brush them with a little olive oil, fold them in half horizontally, and then cut them in half lengthways and brush them with olive oil again. Put some Parma ham on them, scatter this with leeks and roll them up. Finally, brush the parcels with melted butter, scatter them with sesame seeds and bake them for 20 minutes (or until they are crisp and golden) after first heating the oven to gas mark 6/200C till golden, crisp and golden. You can chill them for up to 12 hours before you bake them, as long as you wrap them well.