Wash the chicken fillets and pat them dry. Fry in 1-2 tablespoons of hot oil over medium heat for about 10 minutes while turning. Season with salt and pepper. Clean and wash the celery and bell peppers and cut into bite-sized pieces.
Cut peaches into fine slices. Wash the herbs, pluck the leaves from the stalks. Heat 2 tablespoons of oil. Fry peppers and celery for 3 minutes while turning. Season with salt and peppercorns.
Deglaze with stock and vinegar, simmer for another 3 minutes. Leave to cool, fold in herbs and peach slices, add remaining oil, season if necessary. Cut the chicken filet open and arrange on top.
Serve garnished with fresh herbs and pepper pancakes.