The following was adapted from a wonderful book, The Golden Door Cookbook. The Golden Door is a well established spa in California and has a great reputation. Sadly I have never been there.
I have omitted the fennel at times; I have also added a leek with fine results.
Vegetable Stock
2-3 large carrots, coarsely chopped
2-3 celery stalks, coarsely chopped
1 large onion, peeled and coarsely chopped
8 ounces of button mushrooms, trimmed and sliced
2 plum tomatoes, quartered
1 small fennel bulb, trimmed and coarsely chopped
1 garlic clove, peeled and halved
4 sprigs fresh thyme or 1 teaspoon dried thyme
2 bay leaves
In a pot large enough to hold the above vegetables along with 2 quarts water, place the carrots, celery, onion, fennel, mushrooms, tomatoes, garlic and 2 quarts water. Cover almost completely and bring to a boil over medium high heat. Reduce the heat and skim as much of the foam as you can and discard. Add the thyme and the bay leaves, and simmer gently for an hour.
Allow stock to cool. Then pour it through a strainer into a large container or containers but do NOT push the vegetables to extract more liquid or you will have a cloudy stock. Store in well-sealed, preferably glass, containers. I like Glasslock containers best but Pyrex is also fine. If all you have is plastic, use it!
Let me know what you think of this stock.
Be well!
Marlene