Tuscan Onion Soup (Carabaccia)
If you want to cut down on stirring, you can bake the onions in a roasting pan at 325 degrees F (165 degrees C), stirring a few times along the way. Take your time and wait until they are very soft.
You can also use chicken or vegetable broth in this.
While traditional, many people don't enjoy the effect cinnamon has on the sweetness of the soup, so you may want to omit it, or add an extremely small amount, and then adjust from there. If you don't add any to the pot, you can still experiment by adding a trace amount to a small sample cup, and see what you think.
Substitute Pecorino cheese for the Parmesan if desired.