Cut the chicken into 2 cm cubes and place in a bowl with white wine, rosemary, salt and pepper. Cover and marinate for at least 1 hour.
Then drain the meat and place on 8 skewers, save the marinade. The skewers are then grilled for 10 minutes on the grill (if none are available under the preheated oven grill).
Meanwhile, slowly cook the blackberries for the sauce in a saucepan with the marinade until soft. Then pass through a sieve. Add the apple cider vinegar and jelly to the blackberries in the saucepan and bring to the boil. Simmer open until the sauce is reduced to about a third.
Place the skewers on a plate, drizzle with the finished sauce and garnish with blackberries and rosemary sprigs.