1: Preheat the oven to 200°C (390°F). Prepare and chop the ½ onion. Pour 2 tablespoons olive oil into a pan and when hot, add the chopped onion, salt and pepper. Cook for 1 minute.
2: Add 150 g ham and 150 g cured ham cut into small pieces and cook for about 5 minutes.
3: Add this mixture to 400 g potato purée and mix well.
6: Cook in the oven for 20 to 30 minutes. You can finish the gratin by browning under the grill for a moment if necessary.
Remarks
This goes very well served with a green herby salad in a good vinaigrette dressing. The proportions for this recipe are suggestions, so feel free to adapt them to your own taste.