Pre-heat your oven to gas mark 7/220 degrees. Using a bread knife begin by slicing your loaf lengthways, then turn it around and slice it the other way so that the cuts are criss-crossed. Taking care not to slice all the way through.
Next finely chop the spring onions and slice the green and black olives. In a bowl add the butter, grated cheese, mayonnaise and black pepper and mix everything together.
Now it’s time to stuff your mixture into all the nooks and crannys of your loaf.
Wrap your prepared loaf in tin foil, place on a baking tray in the centre of your oven. After 15 minutes remove the tin foil and return to the oven for a further 15 minutes, or until the cheese is bubbling.
Serve immediately as an accompaniment to your favourite pasta dish.