Cabbage Soup (aka Vegetarian Russian Soup, 素羅宋湯)

Here is a quick and easy, yet quite tasty, soup for a cold winter night.  You can have it ready in less than 30  minutes.

1. Peel and rolling-cut 2-3 carrots (into smaller bite size).  Rinse and cut a small cabbage or half a large cabbage (into larger bite size).  Cut 4-6 Roma tomatoes or 2-3 tomatoes into bite size.
2. Add 1 Tbsp vegetable oil into a pot (medium-sized, ~10" in diameter).  Stir-fry carrots in the pot for 3-4 minutes until carrot pieces are semi-soft.  Season with 1/4 tsp of salt.  
3. Add 1 can of vegetable broth (or chicken broth, i.e., ~14 oz in weight or ~1.5 cups in volume).  Add 3-4 cans of water into the pot (i.e., ~4.5 - 6 cups).  Add cabbage.  Bring to boil and let simmer for 5-6 minutes.
4. Add the tomatoes, and cook for another 5-6 minutes.  Season to taste with salt by adding 1/4 tsp a time and taste. Note- I tend not to add more than 1/2 tsp of Salt, esp. because the broth is already salted.