Peel onions and cut them into rings. Heat oil in a pot and fry the onion rings in it until they are glassy. Deglaze with vegetable stock and white wine and season with salt and pepper. Add caraway seeds and cook at medium heat for about 20 minutes.
Shortly before the end of the cooking time, place two slices of camembert on each baguette and bake briefly under the hot grill. Place the onion soup in soup bowls and place one baguette slice with camembert on each onion soup and serve immediately.