Toss all the vegetables lightly in olive oil just enough to coat.
Roast in a 450 degree (233 C) oven for about half an hour.
Combine the roasted vegetables with remaining ingredients (except for the salt and pepper) in pot and bring to a simmer for about 2 hours.
Strain and adjust the seasonings as needed.
Recipe Notes
Roasting the vegetables enhances their flavor. I only use the beet when making the stock for broth soup. It leaves a pinkish tint to the stock that that I find unacceptable for some soups and most sauces.