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Export 7 ingredients for grocery delivery
Step 1
Preheat the oven to 300F/150C/gas mark 2.
Step 2
Take a heavy-bottomed dish or an ovenproof gratin dish (a Le Creuset is ideal - the potatoes tend not to catch), and grease it will with some of the butter.
Step 3
Layer the potato slices in the dish, slightly overlapping each other, seasoning lightly with the salt and pepper, and sprinkling a liberal amount of cheese on each layer.
Step 4
Sprinkle cheese on the top of the last layer.
Step 5
Put the double cream, garlic and sprigs of thyme in a pan and bring to them gently to the boil, then remove the thyme and pour hot cream over the potatoes.
Step 6
Dot the top of the gratin with the remaining butter and some extra cheese if you wish, and bake for about 1 hr to 1 1/2 hrs, or until the potatoes are soft, and the top is crispy and golden brown.
Step 7
Serve bubbling hot as a main meal or as an accompaniment.