By Alia Black
Slow Cooker French Onion Soup
8 steps
Prep:20minCook:18h 30min
Updated at: Thu, 17 Aug 2023 02:56:50 GMT
Nutrition balance score
Unbalanced
Glycemic Index
39
Low
Glycemic Load
10
Moderate
Nutrition per serving
Calories331.4 kcal (17%)
Total Fat17.8 g (25%)
Carbs25.9 g (10%)
Sugars11.3 g (13%)
Protein16.9 g (34%)
Sodium1621.7 mg (81%)
Fiber3.5 g (12%)
% Daily Values based on a 2,000 calorie diet
Ingredients
8 servings
3 lbsyellow onions
peeled, sliced, and cut into quarter moons
2 Tbspunsalted butter
melted
2 TbspOlive oil
2 tspsalt
more to taste
pepper
to taste
10 cupsreduced-sodium beef broth
2 Tbspbalsamic vinegar
3 Tbspbrandy
optional
To serve
Instructions
Step 1
Place the onions in a 5-quart or larger slow cooker. Stir in the butter, oil, salt, and a generous amount of pepper
Step 2
Cover and cook on the LOW setting overnight until the onions are dark golden-brown and soft, about 12 hours/overnight.
Step 3
Add the broth and vinegar.
Step 4
Cover and continue cooking on the LOW setting for 6 to 8 hours. This is flexible; as long as your slow cooker holds moisture well (wrap a towel over the lid if quite a lot of steam escapes), you can cook the soup for hours. Longer cooking will only intensify the flavors. Taste and season with more salt and pepper if needed, and stir in the brandy if using.
Step 5
Arrange a rack in the upper third of the oven and head to 350ºF. Ladle the soup and onions into oven-safe soup bowls and place the bowls on a rimmed baking sheet.
OvenPreheat
Step 6
Top each bowl with a slice of toast and a generous quantity of shredded gruyere cheese, about 1/3 cup per bowl
Step 7
Bake until the cheese is completely melted, 20 to 30 minutes
Step 8
Turn the oven to broil. Broil until the cheese is bubbling and browned, 2 to 3 minutes. Remove from the oven and let cool for a few minutes. Serve with shopped fresh shallots or onion if desired
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