Wash the potatoes thoroughly, quarter them and put them in cold water. Clean and wash the salad, drain well and pluck into bite-sized pieces. Peel and finely dice the shallots. Mix white wine vinegar, half of the shallots, some salt and pepper.
Finally, fold in 2-3 tablespoons of oil. Wash the chicken fillets and dab dry. Heat 2 tablespoons of oil in a frying pan and fry the fillets for about 10 minutes, turning them over. Finally season with salt and pepper.
Drain potatoes well at the same time. Heat the fat in a coated pan and fry the potatoes for about 5 minutes, turning them slightly. Season with salt and pepper and braise covered at low heat for 10-15 minutes.
Turn in between and finally fry for another 5 minutes without lid until crispy. Wrap the finished chicken fillets in aluminium foil and let them rest for approx. 5 minutes. Wash and clean the blackberries. Sauté remaining shallots in hot chicken fat, add grape juice, blackberries, honey and balsamic vinegar and cook for about 2 minutes.
Mix starch and approx. 2 tbsp. cold water, stir into the blackberry sauce and simmer again for approx. 1 minute. Season to taste with salt and pepper. Mix vinaigrette into the salad. Cut chicken fillets into slices and arrange on plates with blackberry sauce and roast potatoes.
Garnish with parsley. Serve salad separately.