Gently beat the eggs together in a mixing bowl and season, to taste, with salt and freshly ground black pepper.
Heat the butter in an omelette pan until foaming. Pour in the beaten eggs and cook for a few seconds, until the bottom of the omelette is lightly set.
Push the set parts of the omelette into the uncooked centre of the omelette. Cook again, until the omelette has set further, then push those set parts into the centre of the omelette again.
Repeat the process until the eggs have just set but the omelette is still soft in the centre.
Place the cheese and three-quarters of the ham into the centre of the omelette and cook until the cheese has melted.
Increase the heat to high and cook the omelette for a further 30 seconds, or until it browns on the bottom.
Fold the omelette in half, then remove the pan from the heat and tilt it slightly to move the omelette to the edge of the pan. Slide the omelette onto a serving plate, then shape it into a neat roll. Sprinkle over the remaining ham.
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