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.
[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.