Slow-Cooker French Onion Soup

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I made this slow-cooker french onion soup in between Christmas and New Year last year.   It's the first time i've made french onion soup, and i'm glad I did...it's AMAZING!!!   I found the recipe on the Spend with Pennies website...I was searching for recipes made in the slow-cooker, and the ingredient list for this one sounded delicious.  It's not a soup i've eaten very often, but I was expecting a lovely full of flavour beefy broth and super tender sweet caramelised onions...and that's what you get from this recipe.   Add to that oozy cheesy toast on top and it's the perfect combination.  

As you'll see from the tips below, I ended up using marsala instead of sherry...I'm not sure if it's this that gave the sweet taste...i'm sure it's probably a combination of the marsala and the sweetness from the caramelised onions.

Tips

• Marsala – the original recipe uses dry sherry, however, I didn’t have any (I thought I did…!), so I checked online what I could use as a substitute.   The options I found were brandy, dry vermouth, port, madeira or marsala.   I’ve used marsala in pate before, so decided I’d give it a try in this recipe…it’s adds a lovely flavour.
• Any leftovers can be stored in an airtight container in the fridge for a few days and eaten another day.
• This slow-cooker french onion soup recipe is easily halved if you’re cooking for less people.

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Ingredients

• 1kg onions, finely sliced
• 45g butter
• 30g brown sugar (I use soft light brown)
• 1.8l beef stock (made with stock cubes or pots
• 1 tbsp Worcestershire sauce
• 1 clove garlic, crushed
• 75ml marsala (see Tips)
• 4 sprigs fresh thyme, or 1 tsp dried thyme
• 1 bay leaf
• slices of French baguette or bloomer bread (they need to be thickly sliced!)
• 150g gruyere cheese, grated

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Instructions

1. In a large frying pan, cook the onions, butter and brown sugar over a medium to low heat for about 20 minutes until golden and caramelised.
2. Once golden, add to them to the slow-cooker along with the remaining ingredients except the bread and cheese.
3. Cook on low for 6 to 8 hours (I find 6 hours is enough). Heat the grill to high about 5 minutes before the end of the soup cooking time.
4. Grill one side of each slice of bread until lightly golden. Remove and discard the bay leaf and thyme sprigs from the soup, then ladle it into bowls. Place bread on the soup (you might need to cut the slices of bread in halves depending on what kind you use), toasted side onto the soup, then top with grated cheese.   Place the bowls onto a baking tray and then grill for 2 to 3 minutes or until cheese is melted and browned.   Enjoy...with some extra oozy cheesy toast on the side...if you fancy!

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Slow-Cooker French Onion Soup

Deborah

Print Recipe Pin Recipe

Prep Time 20 mins

Cook Time 6 hrs 25 mins

Course Soup, Starter

Cuisine French

Servings 6 to 8 people

Ingredients

  

• 1kg onions finely sliced
• 45g butter
• 30g brown sugar (I use soft light brown)
• 1.8l beef stock (made with stock cubes or pots)
• 1 tbsp Worcestershire sauce
• 1 clove garlic crushed
• 75ml marsala (see Notes)
• 4 sprigs fresh thyme, or 1 tsp dried thyme
• 1 bay leaf
• slices of French baguette or bloomer bread (they need to be thickly sliced!)
• 150g g gruyere cheese grated

Instructions

 

• In a large frying pan, cook the onions, butter and brown sugar over a medium to low heat for about 20 minutes until golden and caramelised.
• Once golden, add to them to the slow-cooker along with the remaining ingredients except the bread and cheese.
• Cook on low for 6 to 8 hours (I find 6 hours is enough). Heat the grill to high about 5 minutes before the end of the soup cooking time.
• Grill one side of each slice of bread until lightly golden. Remove and discard the bay leaf and thyme sprigs from the soup, then ladle it into bowls. Place bread on the soup (you might need to cut the slices of bread in halves depending on what kind you use), toasted side onto the soup, then top with grated cheese.   Place the bowls onto a baking tray and then grill for 2 to 3 minutes or until cheese is melted and browned.   Enjoy...with some extra oozy cheesy toast on the side...if you fancy!

Notes

• Marsala – the original recipe uses dry sherry, however, I didn’t have any (I thought I did…!), so I checked online what I could use as a substitute.   The options I found were brandy, dry vermouth, port, madeira or marsala.   I’ve used marsala in pate before, so decided I’d give it a try in this recipe…it’s adds a lovely flavour.
• Any leftovers can be stored in an airtight container in the fridge for a few days and eaten another day.
• This slow-cooker French onion soup recipe is easily halved if you’re cooking for less people.

 

You might also like to try:

• soups
• slow-cooker dishes

Keyword caramelised onions, comfort food, slow cooker, soup