Fry the onion in the oil for 1 minute and add the oat flakes. Then add the vegetable stock and the Oat Drink. Bring to the boil. Add the courgette. Season with salt and pepper. Simmer for 5 minutes.

Then add the rocket and cook for about 1 minute.

With a blender, puree the soup and season with the lemon juice. If necessary, add some more salt and pepper. Garnish with a few rocket leaves.