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Put the chicken between pieces of plastic wrap and flatten slightly by bashing with a pan.
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Unwrap and sprinkle on both sides with pepper. Heat the oil in a pan over a medium heat, then fry the chicken for 5 minutes, turning halfway through.
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Pour 2 tbsp vinegar over the chicken, add the orange juice and stock and sprinkle with the rosemary and salt.
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Bring to the boil, lower the heat and bubble gently for 15 minutes until tender, spooning with the sauce frequently and turning chicken halfway through.
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Stir in the sugar, butter and rest of the vinegar, then sizzle for a few minutes until reduced and glossy.
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Put the chicken in a serving dish, spoon the sauce over and garnish with orange segments and rosemary sprigs if you wish.
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Serve with rice and a crisp green salad.