A hearty gratin that's a real winter wamer. Preheat the oven to 200C/180C Fan/Gas 6. Butter a wide 3-litre/5¼-pint ovenproof dish. Put the potatoes into a large saucepan, cover with water.

These creamy, cheesy au gratin potatoes cook to perfection ... Just A Pinch Test Kitchen who prepare and review thousands of ...

Put a third of the potatoes into the buttered dish ... who are not Swedish – it is these reheated leftovers that are the real Christmas treat.