Preheat the oven to 200°C/fan 180°C/gas mark 6. Heat the oil in an ovenproof frying pan over a medium heat. Season the chicken breasts, then place in the pan, searing on both sides for 2-3 minutes.
Remove the pan from the heat and brush the chicken with 1½ tbsp pomegranate molasses. Transfer to the oven and cook for 8 minutes, or until cooked through. Remove from the oven and leave to sit for a few minutes.
Meanwhile, cook the grains according to the instructions on the packet. Toss with the feta, red onion, pomegranate seeds and mint.
Divide the grain mixture between 4 serving plates. Slice the chicken, add to the plates and drizzle with the remaining pomegranate molasses. Sprinkle with chopped pistachios to serve.