Vegetable stock sometimes tastes kind of raw and blah. A great way to make a more flavorful stock is by using a lot of caramelized onions. It gives it such a rich nice taste.

3 tablespoons oil
4 onions sliced (cross ways seems to caramelize faster)
2 celery stalks
2 carrots

1. Heat the oil in a big stock pan.
2. Add onions and cook forever until they literally fall apart.
3. Add the celery and carrots and a lot of water and cook for a couple of hours.
4. Add salt to taste.
5. Strain and store in freezer in ziplock bags or by freezing the stock in ice cube trays. Once the cubes are frozen you can empty the trays into a big ziplock.