The ham fillet will obviously be much more than you need for just two lunches, but if you're going to the trouble of cooking one, you may as well cook a larger one so that you can use the leftovers in salads, pasta dishes or quesadillas or slice it thinly for sandwiches for your lunchboxes for the week. Alternatively, if you have leftover ham from a Sunday lunch, use that instead. Kids love having lots of choice, and this classic ploughman's selection ticks all the boxes for a balanced lunch.