Pasta with Leeks and Mussels

You could replace the butter in this recipe with olive oil - which would be better for your heart - but the leeks won’t caramelize in the same way, and it is the sweetness of the leeks which makes this dish. If you like the sweet flavour, you can turn this into more of a party dish by adding one or two fresh dates. Stone them, slice them lengthways into strips, and put them in when you fry the leeks.