saw this in Jamie at Home...he used simple, fresh ingredients from his gardens to whip up this soup, but we didn't exactly follow the complete recipe...
onions (lots of them, maybe around 20-30 - a mixture of the different types would be nice), sliced roughly
leeks (it's basically a giant spring onion), sliced
stock (beef, chicken,etc)
vegetables (eg carrots, broccoli, capsicum, cellery, potato, whatever u like, really)
beef or chicken pieces
Cook the onions and leeks in a bit of oil on slow heat. Cook it down for 25-30 minutes until it breaks down into a brown mush (it doesn't look pretty, but trust me, the taste is dinamite. cooking the onions slowly releases the natural sugar and caramelise the onions).
Pour in your hot stock. Bring to boil and add in the meat, and the rest of the veges. Cook until the meat and veges are tender.