[header] How to make vegetable stock [title] Wash and chop the vegetables. [step] Wash 2 to 3 carrots , 3 to 4 stalks of celery, and get out 1 to 2 onions. Use a sharp knife to carefully chop the vegetables into large chunks. 
If you'd like to add any extra vegetables (such as leeks, fennel, tomatoes, mushrooms, or parsnips) wash and chop them too. You don't need to peel the vegetables first.