Make the dough by hand, as the amount is too small for a food mixer. Place in the fridge to prove for 1–2 hours.
Meanwhile, heat the olive oil and butter in a pan. Add the leeks and a pinch of salt and cook for 10 minutes over a medium heat, stirring regularly. Now add the chilli, mint, cumin and oregano. Reduce the heat and continue to cook for another 10 minutes, until the leeks are s