Corned Beef and Cabbage Soup in a wooden bowl with parsley garnish and two wooden spoons to the left

If you think there’s nothing that tops the comfort food list like corned beef and cabbage, then you need to try this Corned Beef and Cabbage Soup! All the delicious flavors of corned beef, reworked into a soul-warming keto corned beef and cabbage soup full of low carb goodness.

This is the classic Irish corned beef dish you love, transformed into a soup. It’s not only great for leftover corned beef, but has zero of the starchy potatoes you try to avoid on a keto diet.

Upclose image of Corned Beef and Cabbage soup with fennel frond garnish and sliced lemon and fronds in the backbround

Why I created Low Carb Cabbage Soup in the Instant Pot

It wasn’t always the case, but now I love my pressure cooker.  It was comfort food recipes like this Cheesy Keto Super Taco Instant Pot Omelet that won me over.

With this Corned Beef and Cabbage recipe, you can sauté the onions and toast the spices using the sauté setting. As a result, I have less dirty dishes. This is one of the reasons I fell in love with the Instant Pot!

The Instant Pot makes it easy to use more than one function with all of its different settings. Because of these reasons I chose to make my soup in an Instant Pot.

Ingredients for soup

Tips for Corned Beef and Cabbage Soup

Can I use corned beef leftovers for cabbage soup?

Absolutely! You can definitely use your leftover corned beef from St. Patrick’s Day for this instant pot corned beef and cabbage soup. Dice up the corned beef leftovers or shred then and toss them right into the stock! And, it is such a perfect winter dinner! So if you don’t know what to make with leftover corned beef brisket, you’ve found yourself a winning dinner recipe.

How did you make this low carb cabbage soup into a keto soup?

Corned beef and cabbage is not difficult to make ketogenic. Most people eat their corned beef and cabbage with a side potatoes, so most versions of the soup add diced potatoes in the broth. As an alternative, you can add a low carb alternative like diced turnips to your stock and cook like you would potatoes.

Can I make this a slow cooker corned beef and cabbage soup?

Yes! You can certainly make this in a crockpot. Just do the sautéing on your stovetop and finish the recipe off in your slow cooker instead of an Instant Pot. Cook on low for 4-6 hours

Why do you use the saute setting on the Instant Pot for this recipe?

The saute setting allows you to make this a one-pot dinner. You saute the onions, celery, fennel bulb, and garlic and toast the mustard seeds and allspice right in the same pot. As a result, you have less dishes to wash. That always sounds great to me!

Corned Beef and Cabbage Soup in a wooden bowl pinnable image

How to Make Leftover Corned Beef Soup

Time Needed 1 hour and 30 minutes.

Made in the Instant Pot, Corned Beef and Cabbage soup is a delicious way to enjoy your leftover Corned Beef dinner!

  1. Sauté and toast the aromatics.

    First, you will sauté and toast the aromatics. For this, you’ll use the sauté function on your Instant Pot.

  2. Process some of the broth.

    After sautéing and toasting the aromatics, you’ll add liquid to make a vegetable broth. Then, you’ll remove one cup of the mixture to process in a blender. This helps the flavors to marry and makes the stock much heartier with a richer flavor.

  3. Add processed stock and remaining ingredients to pot.

    The processed stock goes back into the pot with the rest of the stock as well as the rest of the ingredients except the fresh herbs and the lemon juice. If you are not using leftover corned beef in this recipe, then this is the step where you would add your raw beef to the Instant Pot.

  4. Add water for more broth

    Fill the pot to the max fill line with water. It may feel like a thick soup, but will thin out as it cooks, as the vegetables release more liquid. Or if you prefer an Irish Corn Beef Stew, don’t thin yours out as much.

  5. Release pressure and serve!

    After the low carb soup is finished cooking, be sure to allow 15 minutes for the pressure cooker to slow release pressure.

    Add your chopped fennel fronds, chopped parsley, and squeeze in the juice of the lemon. Stir it up and enjoy!
    Corned Beef and Cabbage Soup in a wooden bowl with parsley garnish and two wooden spoons to the left

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If you don’t own an Instant Pot, then I highly recommend one! I thought I didn’t need one and resisted buying it. Then when we did get one, I realized it was an awesome tool to use in the kitchen! We’ve had it for quite a while and it’s been so good to us! It has plenty of settings, but is still simple and easy to figure out.

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Corned Beef and Cabbage Soup in a wooden bowl with parsley garnish and two wooden spoons to the left

Corned Beef and Cabbage Soup

Made in the Instant Pot, Corned Beef and Cabbage soup is a delicious way to enjoy your leftover Corned Beef dinner!
4.67 from 6 votes
Print Pin Rate
Course: Appetizers
Cuisine: Irish
Keyword: Cabbage, corned beef, Corned Beef and Cabbage Soup, Leftover Corned Beef, soup
Prep Time: 20 minutes
Cook Time: 50 minutes
Additional Time: 20 minutes
Total Time: 1 hour 30 minutes
Servings: 10 servings
Calories: 331kcal


  • 1 medium onion. diced
  • 2 celery stalks diced
  • 1 fennel bulb diced (reserve fronds)
  • 2 cloves garlic minced
  • 6 tablespoons butter
  • 1 ½ T toasted mustard seed?
  • 3 pounds corned beef diced or shredded
  • Bay leaf
  • 2 tablespoons tomato paste
  • 4 cups chopped cabbage
  • 5 turnips diced small in ¼” cubes (about 2 cups)
  • ½ teaspoon pink salt
  • Freshly ground black pepper to taste
  • ½ cup parsley chopped
  • Fennel fronds
  • Juice of 1 fresh lemon


  • Set the Instant Pot to sauté. It should read “30”.
  • Add butter and onion. Saute for 10 minutes, stirring frequently.
  • Add celery stalks, fennel, and garlic. Saute 6 more minutes.
  • Push vegetables to the sides of the pot so there’s a “hole” in the middle, exposing the metal bottom of the pan. Add the mustard seeds to the middle of the pan and stir, toasting the seeds for 2 minutes.
  • Add the allspice to the center with the mustard seeds and toast for 2 more minutes.
  • Turn off the sauté feature.
  • Add 2 cups water to the pot and stir.
  • Remove 1 cup of the broth and process in a blender till smooth. Return the processed stock to the pot. Stir.
  • Add the corned beef, bay leaf, tomato paste, cabbage, turnips, salt, and pepper. Fill the instant pot up with water till it nears the Max Fill line. Do NOT fill it higher than this line.
  • Place the lid on the Instant Pot, turn the vent to “sealing”, and set the Instant Pot to cook for 30 minutes on high pressure.
  • While the cabbage soup cooks, dice the parsley and fennel fronds, being careful not to use any of the harder stems of the fennel.
  • When the soup is done cooking, allow the Instant Pot to sit and slow release pressure for 15 minutes. After 15 minutes, you may set the vent to “venting” to release the remainder of the pressure.
  • When the pressure cooker is done venting, open the pot. Add the parsley, fennel fronds, and lemon juice, and stir. Serve and enjoy!


Net Carbs = 6


Serving: 2.4 cups | Calories: 331kcal | Carbohydrates: 9.2g | Protein: 20g | Fat: 24g | Sodium: 1221mg | Fiber: 3.2g | Sugar: 3g

About the Author: Shelby Law Ruttan

Shelby is the author/owner of Grumpy's Honeybunch. Established in 2007, she shares and preserves family recipes as well as recipes for cooking light and keto. She is an experienced, self-taught home cook who loves to share recipes with others. You can see her work on websites such as Veal Made Easy, Parade, Community Table, SoFab Food, Yummly, and FoodGawker.


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  3. Anonymous October 12, 2019 at 6:07 pm - Reply


  4. […] Corned Beef and Cabbage Soup […]

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  8. Rhonda Schilling February 21, 2020 at 5:10 am - Reply

    This recipe calls for allspice but it does not give an amount. Also, do the ingredient amounts change if you do not have an instant pot? Thanks! I’m looking forward to trying this.

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Shelby Welcome! I'm Shelby, author of Grumpy's Honeybunch. I have been sharing family favorite recipes since 2007. I started the Keto Diet in October 2017 and since then I have been creating Keto ... read more

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