Can I make French Onion Soup in a slow cooker? You can finish the soup in a slow cooker, but we recommend first caramelizing the onions and reducing the sherry wine on the stovetop through step 5. In step 6, transfer to a slow cooker, add broth and seasonings and cook covered on low heat for 6 hours then season to taste.
Can I substitute the sherry wine? Dry sherry is traditional for making French Onion Soup, but you can substitute it with a dry white wine such as vermouth. Also, keep in mind since the sherry is reduced, you essentially cook out most of the alcohol in the recipe.
How to Serve French Onion Soup (2 Ways)
The way you serve your soup will depend on whether or not you have broiler-safe bowls. If they aren’t broiler safe, the dishes can crack and create a mess in your oven. Whether you have high-heat safe bowls or not, both of these methods will produce delicious results.
With broiler-safe serving bowls:
