Cook the potatoes in a pan of water, drain and let them cool.When cool, cut them into thin slices.
Grease a deep baking dish and add a layer of potatoes. Cover the potatoes with two slices of ham. Scatter some peas, olives and spinach leaves over the ham, then spoon evenly half of the tomato sauce on top and crumble some cheese over the sauce. Season with plenty of ground pepper.
Repeat the layering, finishing off with the cheese.
Chill until you’re ready to bake.
Preheat the oven for 180°C then bake the dish for about 20-25 minutes or until the top is golden.
Serve warm.