Prepare stuffing: Blend the pork, pistachios, pistachio paste, some of the garlic, ginger, 2 tsp grape molasses, and ground cumin with 1 tsp salt. Ensure it's mixed but retains some texture. Test the flavor by frying a small amount.
Shape stuffing: On a cling film-covered board, shape the stuffing into a circle slightly smaller than the chicken breast area. Chill for 30 mins.
Prepare chicken: Dry the chicken with kitchen paper. Loosen the skin over the breast and rub the chicken with a spice blend of cumin, cinnamon, nutmeg, black pepper, and salt. Stuff the breast under the skin with half of the stuffing on each side.
Roast: Cover with foil and roast at 190C for 70 mins. Uncover, baste with molasses mixed with water, and roast at a higher temperature for a crisp finish.
Make sauce: Deglaze the roasting tin with some chicken stock and aromatics from the chicken, reduce, and finish with butter and resting juices.