Homemade Vegetable stock - River Cottage

Ingredients

• 2 large or 3 medium onions
• 3 large or 4 medium carrots
• 3–4 celery stalks
• 1 garlic clove
• 1 tablespoon rapeseed oil
• 1 or 2 bay leaves, roughly torn
• A sprig of thyme and/or some parsley stalks, if you have them
• A few black peppercorns
• ½ small glass dry white wine (optional)