As I walked into the cozy kitchen, the aroma of garlic and ginger wrapped around me like a warm hug. It was the perfect evening for a comforting dish, and that’s when I decided to whip up my Slow Cooker Mongolian Beef. This recipe effortlessly transforms tender flank steak into a savory delight that rivals your favorite takeout. Not only is it a fantastic option for busy weeknights, but it also brings the kind of restaurant-quality flavors right into your home—all without breaking a sweat! Imagine serving your loved ones this easy crowd-pleaser, while knowing it’s gluten-free and can easily be prepped ahead of time. So, are you ready to elevate your dinner game with a dish that’s both indulgent and straightforward? Let’s get cooking!

Why is Slow Cooker Mongolian Beef a Must-Try?
Easy Preparation: This dish requires minimal active cooking time—just slice, mix, and let your slow cooker do the magic.
Flavor Explosion: Infused with fresh garlic and ginger, the savory-sweet sauce is a taste experience that transports you straight to your favorite Asian bistro.
Versatile Adaptations: Whether you prefer beef, chicken, or a delightful mix of vegetables like bell peppers and snap peas, the flexibility of this recipe allows you to cater to any palate.
Crowd-Pleasing Winner: Perfect for family gatherings or dinner parties, everyone will be coming back for seconds! Serve it over rice or noodles, and watch your loved ones savor every bite.
For another fantastic meal option, check out Garlic Butter Beef Bites or add a twist with a touch of spice—just mix in some red pepper flakes!
Slow Cooker Mongolian Beef Ingredients
Unlock the secrets to a delicious meal with these must-have ingredients!
For the Beef
- Flank steak – This lean cut provides tender meat; sirloin or chuck can be good substitutes.
For the Sauce
- Soy sauce – Essential for its umami richness; using low-sodium helps control salt levels.
- Brown sugar – Balances the savory with sweet notes; coconut sugar is a great alternative for a healthier option.
- Garlic (minced) – Fresh garlic boosts the dish’s flavor exponentially; dried garlic won’t have the same impact.
- Ginger (grated) – Freshly grated ginger adds a warm, zesty kick; powdered ginger can be used but will alter the flavor profile.
- Water – Provides essential liquid for cooking; consider low-sodium broth for added flavor.
For Thickening the Sauce
- Cornstarch – Thickens the sauce beautifully; for gluten-free options, replace with arrowroot powder.
With these ingredients on hand, your Slow Cooker Mongolian Beef will truly shine!
Step-by-Step Instructions for Slow Cooker Mongolian Beef
Step 1: Prepare Ingredients
Begin by slicing the flank steak thinly against the grain, which ensures a tender bite. Next, mince three cloves of garlic and grate a one-inch piece of fresh ginger. The vibrant colors and aromas created during this preparation will set the scene for your Slow Cooker Mongolian Beef, making you eager for what’s to come.
Step 2: Mix Sauce
In a medium bowl, whisk together ½ cup of soy sauce, ¼ cup of brown sugar, the minced garlic, and the grated ginger. Add ½ cup of water to this mixture, creating a fragrant, savory sauce that will coat your beef beautifully. Make sure to dissolve the brown sugar completely, allowing it to enhance the overall flavors of your dish.
Step 3: Slow Cook
Place the sliced beef into the slow cooker, spreading it evenly across the bottom. Pour the prepared sauce over the meat, ensuring every piece is well coated. Stir gently to distribute the sauce, then cover your slow cooker with the lid. Set it to cook on low for 3 hours; the beef should be tender and the sauce fragrant by the end of this cooking period.
Step 4: Thicken Sauce
Once the cooking time is complete, it’s time to thicken the sauce. In a small bowl, mix 2 tablespoons of cornstarch with 2 tablespoons of water to create a slurry. Add this mixture to the slow cooker and stir well to incorporate it. Switch the cooker setting to high and let it cook for an additional 30 minutes, allowing the sauce to thicken and achieve that glossy finish.
Step 5: Serve
Your Slow Cooker Mongolian Beef is now ready to be savored! Serve it over a bed of fluffy steamed rice or toss it with noodles for a complete meal. For a fresh touch, consider garnishing with chopped green onions or sesame seeds. Dive into the delightful combination of sweet and savory flavors, and relish in the tender, melt-in-your-mouth beef.

What to Serve with Slow Cooker Mongolian Beef
As the tantalizing aroma wafts through your home, imagine pairing this savory delight with complementary sides that will elevate your meal experience.
- Steamed Jasmine Rice: This fluffy, fragrant rice acts as a perfect base to soak up the delicious sauce, making every bite a delight.
- Stir-Fried Vegetables: A medley of colorful bell peppers, broccoli, and snap peas adds a fresh crunch that balances the rich flavors of the beef. This light side brings vibrancy to your plate!
- Garlic Bok Choy: Quick sautéed with a hint of garlic, this vegetable side adds a tender, juicy contrast while embracing the Asian flavor profile.
- Sesame Noodles: Tossed in a light sesame sauce, these noodles provide a satisfying chew and pair wonderfully with the beef’s sweet-savory notes.
- Cucumber Salad: Crisp cucumber slices drizzled with rice vinegar offer a refreshing contrast to the dish, cleansing your palate between bites.
- Spring Rolls: These crunchy delights, filled with fresh vegetables, add texture and a fun finger-food element to your meal.
- Chilled Sake or Green Tea: For the perfect drink pairing, chilled sake’s warm notes or refreshing green tea enhance the dining experience without overwhelming flavors.
- Chocolate Mousse: End your meal on a sweet note with a rich chocolate mousse, balancing the savory with a touch of indulgence. Its creamy texture provides a lovely contrast to the beef.
These pairing options create a feast that brings together flavors, textures, and a sense of shared joy around the dinner table.
Make Ahead Options
These Slow Cooker Mongolian Beef preparations are ideal for busy weeknights! You can slice the flank steak and mix the sauce up to 24 hours in advance, storing both in separate airtight containers in the refrigerator. To maintain quality, ensure the beef is thinly sliced to keep it tender and avoid browning. On the day you plan to serve, simply combine the beef and sauce in the slow cooker and cook on low for 3 hours (or until tender). If you’re short on time, you can also prep the entire dish ahead of time; just refrigerate it and cook directly from the fridge, adding about an extra 30 minutes to the cooking time. Enjoy effortless, flavorful dinners with this meal prep strategy!
Storage Tips for Slow Cooker Mongolian Beef
Fridge: Store your Slow Cooker Mongolian Beef in an airtight container for up to 3-4 days. Let it cool before sealing to maintain optimal flavor and texture.
Freezer: For longer storage, freeze portions in freezer bags or airtight containers for up to 2-3 months. Label with the date for easy identification.
Reheating: Thaw overnight in the fridge and reheat gently on the stove or in the microwave, adding a splash of water if needed to restore moisture.
Meal Prep: Consider doubling the recipe for easy meal prep! Cook once and enjoy this flavorful dish throughout the week.
Expert Tips for Slow Cooker Mongolian Beef
• Slice with Care: Ensure flank steak is sliced thinly against the grain for maximum tenderness; avoid thick pieces which can lead to a chewier texture.
• Timing Matters: Check the beef after 3 hours; slow cookers vary in heat, and overcooking can result in dry meat.
• Thicken Wisely: For a perfectly thickened sauce, allow enough time for the cornstarch slurry to cook properly; adding it too late can lead to a watery sauce.
• Flavor Boost: Enhance the flavor profile by sautéing the garlic and ginger before adding them to the sauce; this step provides a richer taste.
• Freezing Tips: If you plan to make this Slow Cooker Mongolian Beef ahead, consider portioning it into freezer bags to enjoy on busy nights.
Slow Cooker Mongolian Beef Variations
Feel free to explore these delightful twists to make your Slow Cooker Mongolian Beef entirely your own!
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Gluten-Free: Substitute soy sauce with tamari, ensuring that you enjoy rich flavors without gluten. This small change can make a big difference for those with dietary restrictions.
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Vegetable-Packed: Enhance nutrition by adding bell peppers, snap peas, or broccoli for vibrant color and crunch. This addition elevates the dish’s visual appeal and makes it a complete meal.
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Spicy Kick: For heat lovers, mix in red pepper flakes or sriracha to the sauce. Just a touch can turn this dish into a fiery feast that awakens the senses!
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Sweet & Savory: Experiment with different sugars by swapping brown sugar for honey or maple syrup to create a unique sweet profile. These alternatives will add their own distinct flair, turning familiar ingredients into fresh favorites.
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Protein Alternatives: Replace flank steak with chicken thighs or even tofu for a plant-based option. Marinating tofu beforehand ensures maximum flavor absorption, making every bite satisfying.
While you’re at it, consider pairing your culinary adventures with Ranch Beef Pasta Shells for an additional comforting meal or indulge in the deliciousness of Garlic Butter Beef for a savory twist!
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Citrus Brightener: Add a splash of orange juice or lime zest for a refreshing, zesty flavor that brightens each bite. The citrus notes will play wonderfully with your savory sauce, elevating it to new heights.
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Nutty Texture: Incorporate cashews or sesame seeds as a topping right before serving. Not only do they add crunch, but they also provide a delightful contrast to the tender beef!
With these variations, you can tailor this beloved dish to suit any occasion or mood. Enjoy creating your own version of Slow Cooker Mongolian Beef!

Slow Cooker Mongolian Beef Recipe FAQs
How do I choose the right flank steak for Slow Cooker Mongolian Beef?
Absolutely! When selecting flank steak, look for a piece that is bright red with minimal dark spots or blemishes. The more marbling (thin strips of fat), the more flavor you’ll get. Make sure it feels firm to the touch but not too tough—this indicates freshness. Remember, always slice against the grain to ensure tenderness!
What’s the best way to store leftover Slow Cooker Mongolian Beef?
For sure! Store any leftovers in an airtight container and keep them in the fridge for up to 3-4 days. To maintain the dish’s wonderful flavors, let it cool completely before sealing it. This helps prevent moisture buildup and sogginess.
Can I freeze Slow Cooker Mongolian Beef?
Yes, you can! Freeze your Mongolian Beef in portion-sized freezer bags or airtight containers for up to 2-3 months. To freeze, let the dish cool, then portion it out. It’s helpful to label each bag with the date and contents, so you know what’s inside when you want a quick meal. When you’re ready to eat, thaw it in the fridge overnight and reheat slowly on the stove or microwave.
What should I do if my sauce turns out watery?
Very good question! If your sauce is watery, it might be due to not enough cornstarch slurry or the slow cooker not cooking long enough on high after adding the slurry. To fix it, mix another tablespoon of cornstarch with water to create a slurry and stir it into the sauce, then let it cook on high for about 15 minutes. This should thicken it up nicely. If it’s still too thin, allowing it to cook uncovered for a few more minutes can help evaporate excess liquid!
Is there a gluten-free option for Slow Cooker Mongolian Beef?
Yes, indeed! To make a gluten-free version, simply swap regular soy sauce for a gluten-free soy sauce or tamari. You can also use arrowroot powder instead of cornstarch to thicken the sauce—just mix it with cold water before adding it to the beef. Enjoy a delicious gluten-free meal that everyone can enjoy!
Can I feed Slow Cooker Mongolian Beef to pets or is it safe for everyone?
While it’s tempting to share, it’s best not to feed pet any dish with soy sauce due to its sodium content and possible additives. If you’re exploring variations for your pets, it’s smart to stick with plain cooked meats without any seasoning as special treats. Always check with your vet for any dietary concerns related to your furry friends!

Slow Cooker Mongolian Beef: Easy, Tender, and Irresistible!
Ingredients
Equipment
Method
- Slice the flank steak thinly against the grain.
- Mince the garlic and grate the ginger.
- Whisk together soy sauce, brown sugar, minced garlic, grated ginger, and water in a medium bowl.
- Place the sliced beef in the slow cooker and pour the sauce over it.
- Cover and cook on low for 3 hours.
- Mix cornstarch with water to create a slurry, add to the slow cooker, and cook on high for an additional 30 minutes.
- Serve over rice or noodles, and garnish with chopped green onions or sesame seeds.

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