Note: To get fast results, chop the vegetables first.
Heat one tablespoon of oil and water in a pot and add all the vegetables, salt, and pepper.
Stir the mixture until the vegetables are softened.
Add more water and bay leaves, then bring the mixture to boil.
Once boiled, reduce the heat level and add tomato paste. You can also add nutritional yeast; however, it's optional.
Continue cooking at a low heat level for about half an hour. The more you cook it, the richer the flavor will be.
On completion, taste the vegetable stock. Adjust the flavors accordingly and let it cool.
Finally, pour it in a container.