Clean and wash the peppers and zucchini and cut them into large pieces. Peel and wash carrots and cut them diagonally into wider slices. Peel garlic and also cut into slices.
Fry the vegetables separately, each with a few slices of garlic, in some hot olive oil for 3-5 minutes. Season with thyme, salt and pepper. Mix the remaining oil and lemon juice. Pour 1/3 over each vegetable and leave to stand for at least 3 hours.