Why You’ll Love This Recipe

Slow Cooker Mongolian Beef is a rich, flavorful dish made with tender slices of beef simmered in a sweet and savory sauce. It’s incredibly easy to prepare, thanks to the slow cooker, and delivers restaurant-quality flavor with minimal effort. Perfect served over rice or noodles, this comforting meal is ideal for busy weeknights or cozy weekends at home.

ingredients

Tip: You’ll find the full list of ingredients and measurements in the recipe card below.

flank steakcornstarcholive oilsesame oilgarlicsoy saucesoy saucebrown sugarwatergreen onionsred pepper flakes (optional)

directions

Slice the flank steak thinly against the grain and toss it in cornstarch until evenly coated.

Heat olive oil in a skillet over medium-high heat and quickly sear the steak pieces for 1-2 minutes per side, just until browned.

Transfer the browned steak to your slow cooker.

In a bowl, whisk together soy sauce, brown sugar, garlic, water, and sesame oil. Add red pepper flakes if using.

Pour the sauce over the beef in the slow cooker and stir to coat.

Cover and cook on low for 4-5 hours or on high for 2-3 hours, until the beef is tender and the sauce has thickened.

Add sliced green onions during the last 30 minutes of cooking or just before serving for added freshness and flavor.

Servings and timing

This recipe yields approximately 4 servings.
Preparation time: 15 minutes
Cooking time: 4-5 hours on low or 2-3 hours on high
Total time: 4-5 hours and 15 minutes (low) or 2-3 hours and 15 minutes (high)

Variations

Use chicken or pork instead of beef for a different protein option.
Add vegetables like broccoli, bell peppers, or snap peas during the last hour of cooking.
Use low-sodium soy sauce for a lighter version.
Top with sesame seeds or crushed peanuts for added texture.

storage/reheating

Store leftovers in an airtight container in the refrigerator for up to 4 days.
Reheat in a microwave or on the stovetop until warmed through.
You can also freeze the cooked beef and sauce for up to 2 months; thaw overnight in the refrigerator before reheating.

FAQs

Can I skip browning the beef?

Yes, but searing adds extra flavor and helps seal in the juices.

What cut of beef is best for this recipe?

Flank steak is ideal due to its tenderness and ability to absorb flavor.

Is this dish spicy?

Not unless you add red pepper flakes—feel free to adjust the heat level to your taste.

Can I cook it longer than 5 hours?

It’s best not to overcook, as the beef may become too soft or break apart completely.

What should I serve with Mongolian beef?

White rice, jasmine rice, or noodles pair perfectly, and steamed vegetables make a great side.

Can I double the recipe?

Yes, just ensure your slow cooker is large enough and adjust cooking time slightly if needed.

Is this dish gluten-free?

Use gluten-free soy sauce or tamari to make it suitable for gluten-sensitive diets.

Conclusion

Slow Cooker Mongolian Beef is a no-fuss, flavorful dinner that brings the bold tastes of Asian cuisine to your kitchen with ease. With tender beef, a rich sauce, and customizable spice levels, it’s a crowd-pleasing dish that you’ll want to make again and again.