Cook the barley in salted water for about 15 minutes. Cut the feta into small cubes. Also dice the shallots and sauté in a pan with 2 tablespoons of olive oil. Then dice the zucchini and sauté. Let the whole thing cool down.
Mix the remaining olive oil, herb vinegar, salt, pepper and herbs into a vinaigrette. Mix with the cooked barley, feta and zucchini. Quarter and add the tomatoes before serving.