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Dinner · Part 2 of 3: Instructions

Tender Slow Cooker Mongolian Beef for an Easy Dinner Step-by-step instructions

A close-up of tender, glossy Mongolian beef strips in a black slow cooker with green onion garnish.
Prep
Cook
Total
Serves
4
Includes 3 min resting

Before you start

Before beginning, ensure the beef strips are trimmed of excess fat and are uniform in size to promote even cooking. Have your dark sauce measured and ready to go.

Clear a space on your kitchen counter for the slow cooker and ensure you have a pair of sturdy tongs for mixing the ingredients together efficiently.

Ingredients at a glance (3)
  • 1 1/2 lb beef strips
  • 1 cup dark sauce
  • green onions, for serving

Instructions

Sauce Preparation

  1. Prepare the Base
    Pour the dark sauce into the bottom of the slow cooker. Ensure the base is evenly coated to prevent the beef from sticking during the long cooking process.
    Look for The sauce should be evenly distributed across the bottom of the slow cooker.
    Tip Ensure your slow cooker is clean and dry before adding the sauce.

The sauce mixture should be ready to receive the beef. It should smell aromatic, indicating that the base flavors are properly balanced and ready to penetrate the beef during the long, slow braising process.

Slow Cooking

  1. Slow Cook the Beef
    Add the beef strips to the slow cooker and toss with the sauce using tongs until fully coated. Cover and cook on low for 4 hours until the beef reaches 145°F (63°C). Let the meat rest for at least 3 minutes before serving.
    Look for The beef should be tender and fully cooked through with a deep, glossy color.
    Safe temperature 145°F (63°C) internal temperature (steaks, chops and roasts)
    Tip Avoid lifting the lid frequently to maintain a consistent temperature.

During the cooking phase, the kitchen will fill with the rich, savory scent of the braising liquid.

The beef strips should be completely submerged in the liquid. Check that the slow cooker is set to the low setting to ensure the meat cooks gently.

Final Presentation

  1. Garnish and Serve
    Once the beef has rested, garnish with fresh green onions. Serve the tender beef strips hot over a bed of jasmine rice, ensuring you spoon plenty of the flavorful sauce over the top.
    Look for The green onions should look fresh and vibrant against the dark, glossy beef.
    Tip Use tongs to lift the beef strips carefully to keep them intact.

At the end of the process, the beef will be dark, glossy, and tender enough to pull apart with little effort. The sauce should have thickened into a rich glaze. Check the internal temperature to ensure safety, then garnish.

Common mistakes

A common mistake is failing to ensure the sauce is well-distributed before adding the meat, which can lead to uneven seasoning.

Another error is lifting the lid too often, as this releases the heat and steam necessary for consistent, effective slow cooking. Finally, ensure the beef is not overcrowded in the slow cooker to allow for even heat circulation.

How to tell it’s done

The beef is considered done when it reaches an internal temperature of 145°F (63°C). At this point, the meat should be very tender and easily pierced with a fork.

The sauce will have a deep, dark color and a glossy, slightly syrupy consistency that coats the beef strips thoroughly without being overly runny or thin.

  • Steaks, chops and roasts: 145°F (63°C) in the thickest part, then a 3-minute rest

Coming up in Part 3: common questions

  • Can other cuts of beef be used if beef strips are not available?
  • Is it possible to cook this on high instead of low?
  • Why is it important to slice the beef against the grain?

Also in Part 3: variations (Spicy Mongolian Beef, Vegetable-Packed Beef), 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)