Clean the dandelion and watercress, wash and pluck into bite-sized pieces. Clean and wash the raspberries. Wash lemon thoroughly, rub some peel off. Squeeze the juice. Whip with sherry and 2 tablespoons of oil.
Season to taste with salt, pepper and sugar. Mix dandelion, watercress, raspberries and vinaigrette. Wash the liver and pat dry. Turn gently in the flour. Fry for 3-4 minutes in the remaining hot oil, turning, and season with salt.
Put it on the salad. Serve garnished with lemon slices and dandelion blossoms.