Heat the oil in a pan and sauté the green beans and mushrooms.
Add cabbage and carrots and sauté for 2 more minutes.
Add all the other ingredients and bring to the boil. Simmer for 5 minutes and serve.
For a thicker consistency, mix 1 tablespoon of cornflour or rice flour with ½ cup of soup stock and return it to the pan. Simmer for a few more minutes.