Clean, wash, spin dry and pluck the salad into pieces. Sort blackberries, wash briefly and dab dry. Dice blue cheese. Slice Emmental finely.
Mix vinegar, mustard, salt, pepper and 1 pinch of sugar. Fold in the oil. Loosely mix the vinaigrette with lettuce, blackberries and blue cheese and serve. Sprinkle with Emmental cheese. Serve with nut bread.
Drink tip: cool rosé wine, e.g. a Syrah rosé.