Classic French Onion Soup
When you begin to caramelize the onions, your pot will likely be full to the top. Use tongs to twist and stir the onions until they cook down.
No Gruyere? No problem. Substitute Swiss, Asiago, gouda, or mozzarella cheeses instead.
To prepare in a slow cooker, caramelize the onions in a large pan, whisk the flour into the stock to make a slurry, then add all the ingredients (except bread and cheese) to the cooker on low heat for about 6 hours.