2 tablespoons olive oil
½ cup carrots, chopped
1 cup onion, chopped
½ cup celery, chopped
2 large leeks (white and greens parts), split, cleaned and sliced in ½-inch pieces
3 cloves garlic, minced
2 teaspoons fresh thyme
Salt & pepper
½ head green cabbage, chopped
½ lemon
4 cups vegetable broth
2 bay leaves
Shredded parmesan cheese