Peel and finely chop the onion. Chop the pistachios. Mix vinegar, mustard, onion, pistachios, salt, pepper and sugar. Fold in 4-5 tablespoons of oil
Clean, wash, drain and possibly pluck the salads. Wash, clean and halve tomatoes
Wash the liver, pat dry and cut into pieces. Fry in 1 tbsp. hot oil over medium heat for 4-5 minutes. Season with salt and pepper
Arrange salad, tomatoes and liver. Drizzle with vinaigrette and sprinkle with coarse pepper if desired
Drink: noble sweet white wine, for example a Sauternes