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Tender slow cooker corned beef with vegetables in a crockpot.

Slow Cooker Corned Beef

This slow cooker corned beef recipe offers a hands-off, cozy meal with tender, juicy beef and a tangy mustard sauce that elevates the dish to comfort food perfection.
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Prep Time 15 minutes
Cook Time 9 hours
Total Time 9 hours 15 minutes
Servings: 6 servings
Course: Dinner, Main Course
Cuisine: American, Irish
Calories: 350
Ingredients Method Notes

Ingredients
  

Main Ingredients
  • 1 piece corned beef brisket (about 3 to 4 pounds), spice packet included
  • 1 medium onion, sliced
  • 3 to 4 cloves garlic, smashed (optional) Optional but enhances flavor
  • 3 cups liquid (beef broth, water, or a mix) Usually half broth, half water
  • 1 tablespoon apple cider vinegar Helps balance the salty flavor
  • Optional vegetables: baby potatoes, carrots, and cabbage wedges Add these in the cooking process
For the Tangy Mustard Sauce
  • 1/2 cup Dijon mustard
  • 2 tablespoons whole grain mustard (optional) Adds texture
  • 2 tablespoons honey or brown sugar Adjust to taste
  • 2 tablespoons apple cider vinegar or pickle juice
  • 1/3 cup mayo or Greek yogurt Mayo is richer, yogurt is lighter
  • 1 pinch black pepper

Method
 

Preparation
  1. If you have time, give the corned beef a quick rinse under cool water, then pat it dry. This is optional, but it can take the edge off the salt.
  2. Add sliced onion to the bottom of the slow cooker. It acts like a little rack and adds flavor.
  3. Place the brisket on top, fat side up if it has a fat cap. Sprinkle on the spice packet.
  4. Pour in your liquid and the apple cider vinegar. The beef does not need to be fully submerged, but it should have enough liquid to keep things moist.
Cooking
  1. Cook on low for about 8 to 9 hours, or until it is very tender when you poke it with a fork. If you must use high, plan for about 4 to 5 hours, but low is better for texture.
  2. If adding vegetables: add potatoes and carrots for the last 3 to 4 hours on low. Add cabbage in the last 60 to 90 minutes so it does not turn to mush.
  3. When it is done, lift the beef out and let it rest for 10 to 15 minutes before slicing. This helps it stay juicy.
  4. Slice against the grain to avoid chewiness.
Prepare the Tangy Mustard Sauce
  1. In a small bowl, whisk together all sauce ingredients: Dijon mustard, whole grain mustard, honey or brown sugar, apple cider vinegar or pickle juice, mayo or Greek yogurt, and black pepper.
  2. Taste it and adjust. If it feels too sharp, add a touch more honey. If it feels too sweet, add a tiny splash more vinegar.
  3. You can make it a day ahead.

Notes

Leftovers are highly versatile; use them for hash, sandwiches, or wraps. Store sliced beef in an airtight container for up to 4 days in the fridge, or freeze in portions for 2 to 3 months.