Rustic vegetable soup

Name: Rustic vegetable soup
Ingredients: 1 tbsp rapeseed oil; 1 large onion, chopped; 2 carrots, chopped; 2 celery sticks, chopped; 50g dried red lentils; 1½ l boiling vegetable bouillon (we used Marigold); 2 tbsp tomato purée; 1 tbsp chopped fresh thyme; 1 leek, finely sliced; 175g bite-sized cauliflower florets; 1 courgette, chopped; 3 garlic cloves, finely chopped; ½ large Savoy cabbage, stalks removed and leaves chopped; 1 tbsp basil, chopped