Peel and finely chop the onion. Dice cucumber finely. Finely chop mushrooms and anchovies. Knead minced meat, onion, cucumber, mushrooms, mustard and anchovies. Season with salt and pepper. Spread the minced meat mixture on the ham slices, roll them up and chill them.
Soak gelatine in cold water. Mix stock, tomato paste and egg white with a whisk. Bring to the boil at low heat. Squeeze the gelatine and dissolve in the stock. Add wine and let it simmer for 5 minutes at low heat.
Pour broth through a linen cloth. Cover ham rolls with parsley leaves and pour solidifying jelly over them. Leave to set in the fridge for a few hours. Clean the salad, wash and pat dry.
Arrange ham rolls with salad on a plate. Garnish with tomato rose and chervil.