Mince onion, cherry tomatoes cut in half, and zucchini - semicircles, mushrooms - slices. Salt and pepper zucchini and mushrooms, sprinkle with lemon juice and add the chopped garlic. In a frying pan heat the 2 tablespoons of vegetable oil and fry the mushrooms with zucchini mixture, add the onions and tomatoes, season. Mix the oregano, sage, balsamic, olive oil, salt, pepper and lemon juice, season vegetables and put into the refrigerator for 2 hours. Arrange in portions of salad bowls and serve.