A simple, comforting dish that is great for a cold evening or weekend meal. It is particularly good for using up those odd bits of cheese and ham that you may have in the fridge.
If using new potatoes, they do not need peeling – simply scrub, then slice. * This recipe is also good for using up leftover Christmas turkey and Stilton: use them to replace the ham and Cheddar. * If made ahead, cover while cooking to prevent the gratin drying out. Reheat uncovered at 200°C (gas 6) for 20–30 minutes until heated through and golden brown.