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Heat oven to 190C/170C fan/gas 5.
Peel the potatoes and pat dry with kitchen paper.
Heat the oil and butter in a flameproof dish, add the potatoes and brown all over. This will take about 5 mins.
Season well, add the thyme sprigs and stock, and bring to the boil. Transfer the dish to the oven, uncovered.
Cook for 25-30 mins until the potatoes are tender.