Cut all vegetables stem end off and cut in half, take seeds and membrane out. Cut the green pepper into bite size pieces and put in pot.
Take the outer leaf layers off the cabbage, cut into bite size pieces, put in pot.
Slice mushrooms into thick slices (otherwise they will disappear in the soup), put in pot.
If you would like a spicy soup, add a small amount of cayenne pepper (red pepper) now (1/3 teaspoon is quite a bit as the soup will get spicier as it cooks further).
Combine all ingredients. Bring to a boil then reduce heat, cover and cook on low for 1/2 hour.