Delicious Slow Cooker Mongolian Beef

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If you’re looking for a flavorful dinner that requires very little hands-on cooking, Slow Cooker Mongolian Beef is an excellent choice. Tender strips of beef simmer slowly in a rich, savory-sweet sauce made with soy sauce, brown sugar, garlic, ginger, and a hint of chili. The result is a comforting meal with takeout-style flavors that’s easy to make at home.

This recipe is perfect for busy weeknights because the slow cooker handles most of the work. After a few minutes of preparation, you can let everything cook until the beef becomes tender and absorbs the delicious sauce.

Whether you’re building a collection of easy slow cooker meals, searching for a satisfying slow cooker beef recipe, or simply want a flavorful family dinner, this Mongolian-inspired dish is worth adding to your rotation.

Why You’ll Love Slow Cooker Mongolian Beef

There are plenty of reasons this recipe works so well for weeknight dinners:

• Tender slow-cooked beef
• Rich sweet and savory sauce
• Simple pantry ingredients
• Minimal preparation
• Easy slow cooker method
• Great over rice
• Family-friendly
• Excellent leftovers
• Easy to customize
• Perfect for meal prep

The sauce is the highlight of this dish. Brown sugar adds sweetness, soy sauce brings savory depth, while garlic and ginger provide warmth and freshness.

Ingredients

For the Beef

• 2 pounds flank steak or sirloin steak
• ¼ cup cornstarch
• ½ teaspoon salt
• ½ teaspoon black pepper
• 1 tablespoon vegetable oil

For the Sauce

• ¾ cup low-sodium soy sauce
• ¾ cup beef broth
• ½ cup packed brown sugar
• 4 cloves garlic, minced
• 1 tablespoon fresh ginger, grated
• 1 tablespoon rice vinegar
• 1 teaspoon sesame oil
• ½ teaspoon red pepper flakes, optional

For Serving

• Cooked white or brown rice
• Sliced green onions
• Sesame seeds
• Steamed broccoli
• Sliced carrots

How to Make Slow Cooker Mongolian Beef

1. Slice the Beef

For tender slow cooker beef, start by slicing the steak thinly against the grain.

If the beef is difficult to slice, place it in the freezer for approximately 20–30 minutes first. The slightly firmer texture makes thin slicing much easier.

Cut the beef into strips approximately ¼-inch thick.

2. Coat the Beef

Place the sliced beef in a large bowl.

Sprinkle the cornstarch over the beef and toss until each piece is lightly coated.

The cornstarch helps create a slightly thicker sauce as the beef cooks and gives the finished dish a wonderful texture.

3. Optional Searing Step

For additional flavor, heat vegetable oil in a large skillet over medium-high heat.

Sear the beef in batches for approximately 1–2 minutes per side.

You don’t need to cook it through. The goal is simply to brown the outside.

This step is optional, but it adds extra depth to the finished dish.

4. Add the Beef to the Slow Cooker

Transfer the beef to the slow cooker.

Spread it into an even layer.

If you skipped the searing step, simply add the coated beef directly to the crockpot.

5. Prepare the Sauce

In a bowl, whisk together soy sauce, beef broth, brown sugar, minced garlic, fresh ginger, rice vinegar, sesame oil, and red pepper flakes.

Pour the sauce evenly over the beef.

Make sure all the beef is coated.

6. Slow Cook

Cover the slow cooker with the lid.

Cook on:

LOW: 4–5 hours

HIGH: 2–3 hours

The beef should be tender when finished.

Avoid cooking it significantly longer than necessary, especially if using a leaner cut of beef.

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7. Thicken the Sauce if Needed

If the sauce isn’t as thick as you’d like, transfer some of the liquid to a small saucepan.

Bring it to a gentle simmer and cook for a few minutes until slightly reduced.

Alternatively, mix 1 tablespoon cornstarch with 2 tablespoons cold water and stir it into the sauce.

Allow it to cook briefly until thickened.

8. Garnish and Serve

Spoon the Mongolian beef over freshly cooked rice.

Garnish with sliced green onions and sesame seeds.

Add steamed broccoli, carrots, or another vegetable for a complete meal.

Serve hot.

Tips for the Best Slow Cooker Mongolian Beef

Slice Against the Grain

Cutting beef against the grain shortens the muscle fibers, which helps create a more tender bite.

Don’t Skip the Cornstarch

The cornstarch helps thicken the sauce and gives the beef a pleasant texture.

Use Low-Sodium Soy Sauce

Because soy sauce is naturally salty, low-sodium soy sauce gives you more control over the final flavor.

Adjust the Sweetness

Mongolian beef traditionally has a sweet-savory flavor. If you prefer a less sweet sauce, reduce the brown sugar slightly.

Add Heat Carefully

Red pepper flakes provide mild heat. Add more if you prefer a spicier dinner.

Is Mongolian Beef Korean Beef?

Although the flavors can overlap, Mongolian beef and Korean beef aren’t the same dish.

This recipe uses ingredients commonly associated with Asian-inspired cooking, such as soy sauce, ginger, garlic, and sesame oil.

If you’re searching for slow cooker Korean beef, you can adapt this recipe by adding a little gochujang or serving the beef with Korean-style sides. However, the resulting dish will have a different flavor profile.

What About Beef Curry?

Beef curry is another delicious slow-cooked dish, but it typically uses curry spices or curry paste and has a distinctly different flavor profile.

Mongolian beef is primarily sweet, savory, garlicky, and gingery rather than curry-forward.

If you enjoy both styles, consider rotating them through your weekly slow cooker recipes.

Easy Variations

Mongolian Beef and Broccoli

Add steamed broccoli just before serving. This is one of the easiest ways to add vegetables.

Spicy Mongolian Beef

Increase the red pepper flakes or add a small amount of chili paste.

Vegetable Mongolian Beef

Serve the beef with bell peppers, carrots, broccoli, snow peas, or mushrooms.

Chicken Mongolian

Replace the beef with thinly sliced chicken for a lighter variation.

Gluten-Free Mongolian Beef

Use gluten-free tamari or certified gluten-free soy sauce.

How to Serve

Rice is the classic pairing for Mongolian beef because it absorbs the flavorful sauce.

Try serving it with:

• White rice
• Brown rice
• Jasmine rice
• Cauliflower rice
• Rice noodles
• Steamed broccoli
• Stir-fried vegetables

For extra freshness, garnish with green onions, sesame seeds, or fresh cilantro.

Storage and Meal Prep

This recipe is excellent for meal prep.

Allow the beef to cool before transferring it to airtight containers.

Refrigerate for up to 4 days.

Store rice and beef separately when possible.

Reheat gently in the microwave or on the stovetop.

If the sauce thickens too much after refrigeration, add a splash of beef broth or water while reheating.

You can also freeze the cooked beef and sauce for up to 3 months.

Thaw overnight in the refrigerator before reheating.

Frequently Asked Questions

What cut of beef is best?

Flank steak and sirloin work well. Chuck roast can also be used, although the cooking time may need adjustment.

Can I make this without searing?

Yes. Searing is optional. It adds extra flavor but isn’t necessary for a successful slow cooker recipe.

Can I make it less sweet?

Yes. Reduce the brown sugar according to your preference.

Can I add vegetables?

Absolutely. Broccoli, carrots, bell peppers, mushrooms, and snow peas all work well.

Can I use chicken?

Yes. Thinly sliced chicken can replace the beef, although the cooking time will be different.

Final Thoughts

Slow Cooker Mongolian Beef is a flavorful, comforting dinner that combines tender beef with a rich sweet-and-savory sauce. With simple ingredients and minimal preparation, it’s an easy addition to your collection of slow cooker meals.

Serve it over rice with steamed broccoli and garnish with green onions and sesame seeds for a complete dinner. Whether you’re looking for slow cooker beef, experimenting with slow cooker recipes, or simply want a homemade alternative to takeout, this recipe delivers plenty of flavor with very little effort.