Bring salted water to a boil and cook the barley for the time indicated on the package. Once cooked, let it cool.
Wash the cherry tomatoes and cut them in half. Heat the plate and, when it is hot, place the cherry tomatoes with the peel facing upwards. Roast on both sides.
Cut the watermelon, remove the seeds and cut it into cubes.
Cut the cheese into flakes and set aside.
Finely slice the onion. Peel the cucumber and cut it into thin slices.
Clean and wash the salad, dry it thoroughly and set aside.
In a salad bowl, combine the salad, watermelon, onion, cucumber, roasted cherry tomatoes. Complete with black olives, flaked cheese and barley.
Season with salt, oil and balsamic vinegar