French Onion Soup Slow Cooker Recipe Uk

Recipes
Dish type
Soup
Vegetable soup
Root vegetable soup
Onion soup
French onion soup

Slow cooker French onion soup

So easy, especially since the slow cooker does all the work! This is a lovely, comforting soup to come home to on a blustery evening.

331 people made this

Ingredients
Serves: 8

6 tablespoons butter
4 large Spanish onions, sliced and separated into rings
1 tablespoon sugar
2 cloves garlic, minced
120ml sherry
1.5L beef stock
Salt, to taste

1/4 teaspoon dried thyme
1 bay leaf
8 slices of French baguette
60g Gruyere cheese, grated
40g Emmental cheese, grated
20g fresh Parmesan cheese, grated
2 tablespoons mozzarella cheese, grated

Method
Prep:30 min › Cook:5 hr › Ready in:5 hr 30 min

Heat butter in a large, heavy pot over medium-high heat; cook and stir onions until they become soft, about 10 minutes. Sprinkle onions with sugar; reduce heat to medium. Cook, stirring constantly, until onions are soft and browned, at least 30 minutes. Stir in garlic and cook until fragrant, about 1 minute.
Stir sherry into onion mixture and scrape bottom of pot to release any small bits of caramelised onion stuck to the bottom. Transfer onions into a slow cooker and pour in beef stock. Season to taste with sea salt; stir in thyme and bay leaf. Cover cooker, set on High, and cook 4 to 6 hours. If desired, set on Low and cook 8 to 10 hours.
About 10 minutes before serving, arrange bread slices on a baking tray and toast both sides under the grill.
Combine all the grated cheeses in a bowl, tossing lightly. Fill oven-safe soup bowls 3/4 full of onion soup and set a bread slice in each bowl. Top with about 2 tablespoons of cheese mixture per serving.
Place bowls on a baking tray and grill until cheese topping is lightly browned and bubbling, about 2 minutes.

Note

You don't have caramelise the onions, you can simply melt the butter in your slow cooker, add the onions to coat them and then add all the ingredients and cook. However, caramelising the onions makes for a much, much better soup.

Similar recipes

Reviews & ratings
Average global rating:
(347)

Reviews in English (263)

AlexFoster

Why not use the slow cooker to caramelise the onions first - overnight on low, onions, butter in the slow cooker - then add the remainder of the ingredients the following morning? - 28 Sep 2014

angjen

Used English onions and red wine instead of sherry (someone had drunk the sherry) ! It tasted divine, just like a posh restaurants. I will definitely make it again without a doubt. - 02 Feb 2013

used white wine instead of sherry as thats all i had smells great hopefully will taste great too - 16 Apr 2013