Clean the lettuce, cut into bite-sized pieces and spin dry in a large bowl (or serve on plates). Wash tomatoes, cut in half and pour over the lettuce.
Drain the mozzarella well, pat dry and dice, add to the salad.
Finely chop the herbs and mix with oil, vinegar, salt, pepper, sugar and chopped garlic to a marinade (if it is too acidic, add a little water) and marinate the salad with it, roughly crumble the smoked trout fillets and serve over the salad.