Vegetable Stock

• 3 medium onions, peeled and chopped
• 1 small head celery, chopped
• 3 leeks, trimmed,

Put all the ingredients into a pot and cover them with cold water.

Bring it to the boil, skim off any scum that forms and simmer for 30-40 minutes.

Strain it through a fine-meshed sieve. Check the strength of the stock and reduce it if necessary.