Peel, wash and slice the carrots. Clean spring onions and celery (put 4 small leaves aside for garnishing), wash and cut into rings or slices.
Quarter the peppers, remove seeds, wash and cut into strips. Clean the cabbage, remove the stalk. Cut cabbage into bite-sized pieces. In a saucepan, mix stock, tomatoes and vegetables, cover and cook over medium heat for 15-20 minutes.
Arrange on plates and garnish with celery leaves.