<human>:  How to make a vegetable stock?
<bot>: 
1. Start by gathering the ingredients you need.
2. In a large pot, sauté the onions, carrots, celery, and garlic in a small amount of oil over medium heat until they are softened.
3. Add in 6-8 cups of cold water and the herbs and spices.
4. Bring the pot to a simmer, reduce the heat and let the stock cook for 45 minutes to 1 hour, or until all of the vegetables are soft.
5. Strain the vegetable stock, discarding the vegetables.
6. Let the stock cool before storing in jars or air-tight containers.