Slow Cooker Sunday – Caramelized Onion Soup

The weather is going to make a turn for the worst this week so if you’ve packed your slow cooker up for the summer it may be time to dig it out!

Slow Cooker Sunday is all about sharing your favourite recipes; you can either link up a blog post or a website you have used, tweet a picture with #scsunday and I’ll include your twitter handles so people can contact you about recipe or you can leave a recipe in the comments section.

This week we had Caramalized Onion Soup, for me it was reminiscent of French Onion Soup.  The recipe came from Sara Lewis’ 200 More Slow Cooker Recipes.  If you don’t already have one of her books I’d highly recommend them as I’ve rarely had disasters with her recipes.

Caramelized Onion Soup

  • Serves 4
  • Cooking Temp:  Low
  • Cooking Time 4-5 hours


  • 25 g of butter
  • 2TBSP Olive Oil
  • 500 g onions, halved and thinly sliced
  • 1TBSP Caster Sugar
  • 2TBSP plain flour
  • 250ml brown ale
  • 750ml of Beef Stock
  • 2 bay leaves (I didn’t have any so skipped them)
  • 1 TBSP Worcestershire Sauce
  • Salt and Pepper

Cheese Toast

  • 8 slices of French bread
  • 75 g cheddar cheese
  • 2 TSP Worcestershire Sauce


  1. Heat the oil and butter in a frying pan and sauté the onions for about 15 till they are soft and starting to turn golden.  Then add the caster sugar and fry for another 10 minutes until they start to caramelize on the edges.
  2. Stir in the flour, mix for about a minute.  Then gradually add the stock, ale and Worcestershire sauce.  Season with salt and pepper, bring to a boil and then transfer to the slow cooker.  Cover and cook for 4-5 hours on low.
  3. When it’s just about time to serve, sprinkle cheese onto the French bread and drizzle a bit of Worcestershire Sauce on each one.  Grill until the cheese starts to bubble.
  4. Serve the soup in large bowls and float the toast on top.

I look forward to seeing your recipes!

Author: mediocremum

A slightly older mum of one, who drinks far too much red wine and has an unhealthy obsession with her slow cooker. During the day she's an ICT Trainer, Social Media/Online Marketing consultant and does a bit of public speaking. Full Profile on Google+

7 thoughts on “Slow Cooker Sunday – Caramelized Onion Soup”

    1. I’d love to have a third one. Like you said, you could have a 3 course meal going at once. (Starter, Main and Pudding).

  1. Oh, it sounds great. I love soups (especially a carrot soup with curry and a creamy pea soup with mint). I tried onion soup once, but it took me just one hour. That’s the reason why I am fascinating by the cooking time you wrote in your post. I’m not able to imagine the flavour of the soup after 4, 5 hours of cooking. I definitely need to try it! Cannot wait..

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