Preheat the oven to 180C/160F/Gas mark 4.
Put all the ingredients, except the butter, in a pan over a medium heat. Bring to the boil, until bubbles form around the edge of the pan.
Reduce the heat slightly and cook for 15 minutes, stirring occasionally, until the potatoes are just beginning to soften. Season with salt and pepper.
Meanwhile, grease a large baking dish with butter. Transfer the potatoes to the dish using a slotted spoon, then pour over the cream. Bake in the oven for an hour, until golden.
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