Using Leftover Corned Beef Broth for French Onion Soup

Diamond Post Medal for All Time! 1,246 Posts
March 28, 2017

A pan of French onion soup.One more reason to love St. Patrick's Day! The leftover broth from boiling that giant corned beef. I always freak out when people pour it down the drain because I love to make soup. It has so much flavour from hours of stewing, you don't need to add too much to it to make it a flavourful second-hand meal. This is my recipe for turning the leftover broth to a delicious French onion soup.


Prep Time: 10 minutes

Cook Time: 1 hour

Total Time: 1 hour 10 minutes

Yield: 4 servings


  • 3 large onions, sliced
  • 2 Tbsp oil
  • 1 tsp sugar
  • 1 large garlic clove, minced
  • 1/4 cup water or white wine
  • 4 cups leftover corned beef broth
  • 1 bay leaf
  • 1 tsp dried thyme
  • French bread or any bread you like
  • 1/2 cup Swiss or Gruyere cheese
ingredients for French onion soup.
bread and cheese for French onion soup.


  1. Slice the onions relatively thin. In a large pot, heat one tablespoon of oil on medium heat. Add the onions and toss to coat with the oil. Cook the onions, stirring often. It will take about 15 minutes to soften.
  2. slicing onions for French onion soup.
    sautéing onions for French onion soup.
  3. Increase the heat to medium high. Add the remaining one tablespoon of oil and the butter. Cook for another 15 minutes stirring often.
  4. adding butter to onions for French onion soup.

  5. Sprinkle with sugar to help with the caramelization process. Cook until well browned, about 10 more minutes.
  6. adding sugar to onions for French onion soup.
  7. Mince the clove of garlic and add to the onions. Cook one minute. Pour in 1/4 cup of water or white wine to deglaze the pot, picking up all the fond (brown bits) from the bottom of your pot.
  8. caramelized onions for French onion soup.
  9. Add the broth, the bay leaf, and thyme. Bring to a boil, simmer, and the cover pot. Cook for about 30 minutes.
  10. adding bayleaf to broth for French onion soup.
    lid on pan of simmering broth for French onion soup.

  11. Remove bay leaf and sprinkle with pepper. Transfer soup to oven-proof bowls or casserole dish.
  12. pouring soup in pan for oven for French onion soup.
  13. Cover soup with the bread slices.
  14. adding bread sliced to broth in pan for French onion soup.
  15. Top bread slices with cheese. Put dish into the broiler for 10 minutes at 350° F until the cheese bubbles and is slightly browned.
  16. cheese slices on bread in pan for French onion soup.
    cooked French Onion Soup from Leftover Corned Beef Broth for French onion soup.
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