Remove the skin from the salmon steak and divide into two parts.
Marinate squid and salmon in a marinade of olive oil, Provencal herbs, balsamic vinegar, white wine vinegar, lemon juice, sugar and salt for exactly 1 hour.
While the squid and salmon are marinating, prepare a salad. Fry the zucchini, eggplant, pepper and onion on both sides in a dry frying pan. Put it in a bowl, add salt and pour olive oil.
Cut the squid into 4 parts (so that each squid turns into 4 long strips). Cut the salmon into small cubes. Roll the squid with salmon into a roll, string it on a skewer, alternating olives with a roll.
Fry the squid on skewers on all sides for 1 minute. If desired, you can repeat the procedure.