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Dinner · Part 2 of 3: Instructions

Slow Cooker Midwest Loose Meat Sandwiches Step-by-step instructions

A close-up of a slow cooker filled with savory, cooked ground beef and onion mixture.
Prep
Cook
Total
Serves
6

Before you start

Before beginning, ensure your slow cooker insert is clean and dry. Finely dice the onion into small, uniform pieces to ensure they cook evenly and integrate well with the ground beef. Measure out your spices and prepare the beef broth in advance.

If you are using frozen beef, ensure it is completely thawed in the refrigerator before adding it to the slow cooker to maintain food safety standards. Have your serving buns and any desired toppings ready to go once the cooking time is complete.

Ingredients at a glance (5)
  • 2 lb ground beef
  • 1 cup onion, finely diced
  • 1 tsp dry mustard
  • 1/2 tsp black pepper
  • 1/2 cup beef broth

Instructions

Preparation and assembly

  1. Assemble the ingredients
    Place the raw ground beef into the slow cooker insert, breaking it apart into small, even crumbles with your fingers or a spoon. Scatter the finely diced onion evenly over the top of the beef. Sprinkle the dry mustard and black pepper across the mixture to ensure even seasoning throughout the meat. Finally, pour the beef broth over the ingredients to provide moisture for the slow cooking process.
    Look for The beef should be broken into small pieces for a uniform texture.
    Tip Using a higher fat content ground beef adds richness to the final sandwich filling.

At the end of this phase, the ingredients should be neatly arranged in the slow cooker. The beef should be distributed evenly, and the spices and onions should be scattered across the top. The broth should be poured over the mixture to provide the necessary moisture. Ensure that the meat is broken into small, consistent crumbles before closing the lid to begin the cooking process.

Slow cooking process

  1. Slow cook the mixture
    Cover the slow cooker with its lid and set to cook on the low setting for approximately 4 hours. This gentle, low-heat cooking method allows the beef to become tender while absorbing the savory flavors of the onion, mustard, and broth. Avoid lifting the lid during the cooking process to ensure a consistent internal temperature and to prevent any loss of moisture from the cooking chamber.
    Look for The onion should be soft and translucent.
    Tip Check the progress halfway through to ensure the liquid has not evaporated too quickly.

During the slow cooking phase, the mixture will gradually develop a rich, savory aroma. The beef will release its juices, and the onions will become translucent and soft. The internal temperature will rise steadily.

By the end of this phase, the kitchen should smell savory and slightly tangy from the mustard, indicating that the flavors are melding together effectively as the meat reaches its target internal temperature.

Finalizing and serving

  1. Finalize and serve
    Once the cooking time is complete, ensure the ground beef has reached an internal temperature of at least 160°F (71°C) to ensure it is cooked through safely. Stir the mixture well to combine the cooking juices with the meat and onions. Serve the warm, flavorful beef mixture piled high on toasted buns. If there are leftovers, allow them to cool for no more than two hours before storing them in an airtight container.
    Look for The beef should be moist, fully cooked, and fragrant.
    Safe temperature 160°F (71°C) internal temperature (ground meat)
    Tip Toast the buns lightly before serving to provide a nice contrast to the moist meat filling.

Once the cooking is finished, the mixture should be stirred thoroughly to ensure the juices are evenly distributed. The beef should be tender and moist, with the onions fully incorporated. Check that the meat has reached 160°F (71°C). The final mixture should be ready to be served immediately on buns, maintaining a warm, satisfying temperature that is perfect for a casual meal.

Common mistakes

A common mistake is failing to break the ground beef into small, uniform crumbles before starting the slow cooker, which can lead to large, uneven clumps that do not cook through as effectively.

Another error is adding too much liquid; the goal is a moist, not soupy, mixture. Avoid opening the lid frequently during the cooking process, as this releases heat and steam, significantly increasing the total cooking time and potentially drying out the ingredients.

How to tell it’s done

The loose meat mixture is done when the ground beef is fully cooked and has reached a safe internal temperature of 160°F (71°C). The texture should be uniformly moist, with no signs of pinkness remaining in the meat.

The onions should be soft and almost fully integrated into the beef, and the liquid should be reduced to a flavorful, savory jus that coats the meat rather than sitting as a pool at the bottom of the slow cooker.

  • Ground meat: 160°F (71°C) in the thickest part

Coming up in Part 3: common questions

  • Can this be made ahead of time?
  • What is the best way to reheat leftovers?
  • Can this be frozen for later?

Also in Part 3: variations (Cheesy Loose Meat, Spicy Version), storage and make-ahead, and the printable recipe card.

Up next · Part 3 of 3

2 variations · storage & make-ahead · 3 answers · printable card

Tips, FAQ & printable recipe (Part 3)← Back to the ingredients (Part 1)