Cut breats in half lengthways. Sprinkle pepper on both sides.
heat oil, fry chicken for 5 mins, turning halfway through.
Pour 2 tbsp vinegar over the chicken, add the orange juice (i have used orange and mango juice or pineapple juice - both nice too) and stock and sprinkle with the rosemary (I used dried) and salt. bring to the boil, lower heat and bubble gently for 5 mins until tender, spooning with the sauce frequently, turning chicken halfway through.
Stir in the sugar, butter and rest of vinegar, then sizzle until reduced and glossy (wait for it, it's worth it).
Serve with the sauce over.
Can serve with orange segments and rosemary