I used pecorino because that's what I had. But I'd have used up any hard cheese that was in the fridge - parmesan, gruyère, lancashire, whatever.
200g mashed potato (approx. ratio of potato:butter:milk at 10:1:1)
25g ham, chopped
2 spring onions, finely chopped
3 green olives, flesh chopped
25g pecorino sardo, finely grated
Beat the egg and fold into the mash. Add the ham, spring onions, olives, cheese and black pepper and mix well. Spoon into a small souffle dish or similar and bake at 200C/180C fan for about 20-25 minutes. Serve with a handful of simply dressed salad leaves.