Peel and finely chop the onion. Clean, wash and quarter the tomatoes. Clean, wash and thinly slice the cucumber. Wash, drain and sort the sprouts. Wash lettuce, dab dry and chop. Coarsely chop the nuts. Mix vinegar, honey, mustard, salt and pepper and add 1 teaspoon of oil.
Mix the prepared salad ingredients and marinade, leave to stand for a while. Wash the chicken and pat dry. Heat the remaining oil in a coated pan. Fry the fillet for about 5 minutes on each side. Season with salt and pepper. Cut the fillet open and serve with salad