Slow Cooker Mongolian Beef is the kind of recipe that turns your kitchen into your favorite takeout spot—but without the guilt or the long wait. Imagine tender strips of beef soaking in a rich soy-garlic sauce, filling your home with the kind of aroma that makes the whole family wander in, asking, “When’s dinner?” With a short prep time and a slow cooker doing most of the heavy lifting, this dish is pure magic for busy weeknights. Whether you’re feeding picky eaters or just craving something savory and satisfying, slow cooker Mongolian beef hits all the right notes—sweet, salty, garlicky, and downright irresistible.
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What is Slow Cooker Mongolian Beef?
Slow Cooker Mongolian Beef is a home-cooked version of the beloved restaurant classic, but simpler and much healthier. Traditionally, Mongolian beef is stir-fried over high heat, but here the slow cooker works its magic to make the meat melt-in-your-mouth tender. The dish combines thin slices of flank steak with soy sauce, garlic, ginger, brown sugar, and a hint of sesame oil to create that glossy, flavorful sauce we all crave. Over a few hours, the beef soaks up every bit of flavor, leaving you with a comforting meal that tastes like you’ve spent all day perfecting it (even though you didn’t). Serve it over rice or noodles, and you’ve got a dish that makes everyone happy.
Reasons to Try Slow Cooker Mongolian Beef
Let’s be honest—some days, you just need dinner to make itself. That’s where Slow Cooker Mongolian Beef saves the day. It’s a hands-off, no-fuss recipe that still delivers restaurant-level flavor. Plus, it’s customizable—add broccoli, snap peas, or carrots if you want to sneak in more veggies. It’s also budget-friendly since flank steak is an affordable cut that becomes incredibly tender when cooked low and slow. The sauce thickens perfectly without extra effort, coating every slice of beef in a glossy, savory-sweet glaze. And here’s the best part: it reheats beautifully, so leftovers (if there are any) taste just as good the next day.
Ingredients Needed to Make Slow Cooker Mongolian Beef
- 1 ½ pounds flank steak, thinly sliced against the grain
- ¼ cup cornstarch
- 1 tablespoon toasted sesame oil
- 1 teaspoon minced garlic
- 1 teaspoon minced ginger
- ½ cup low sodium soy sauce
- ⅓ cup brown sugar
- ½ cup water
- ½ cup green onions, cut into ½-inch pieces
Instructions to Make Slow Cooker Mongolian Beef (Step by Step)
If you’re ready to bring restaurant-quality flavor to your dinner table with minimal effort, follow this step-by-step Slow Cooker Mongolian Beef guide. Each stage walks you through exactly what to do—from slicing your steak to plating that glossy, tender beef that practically melts in your mouth. You don’t need to be a kitchen pro to nail this recipe; just follow along, and your slow cooker will do most of the heavy lifting.
Step 1: Slice and Prep Your Beef Like a Pro
The first step by step in making perfect Slow Cooker Mongolian Beef is prepping your flank steak. Lay the steak flat on a cutting board and slice it thinly against the grain—this means cutting across the muscle fibers, not along them. This technique guarantees every bite will be tender, not chewy. If the beef is slightly frozen, it’s even easier to slice thinly. Once you’ve got your slices ready, toss them in a medium bowl with cornstarch. The cornstarch acts as a secret thickener later on, helping the sauce cling to every piece of beef.
Next up in this step by step process, it’s time to make the heart of the dish—the sauce. In your slow cooker, combine toasted sesame oil, minced garlic, minced ginger, low-sodium soy sauce, brown sugar, and water. Stir everything together until the sugar dissolves and the mixture smells irresistible. This combination creates that classic Mongolian flavor—sweet, salty, and full of umami depth. Want to personalize it? You can adjust the sweetness by adding a touch more brown sugar or balance it with a splash of rice vinegar for brightness. If you’re interested in learning how to build Asian-inspired sauces, you might love our Sticky Garlic Chicken Noodles recipe for more flavor inspiration.
Step 3: Combine and Coat the Beef in the Sauce
Once your sauce is ready, gently add the cornstarch-coated beef slices to the slow cooker. Stir until each piece of steak is evenly coated in the sauce—it should look glossy and rich. This step by step blending of the beef and sauce ensures that every bite is perfectly seasoned. Make sure not to overcrowd the slow cooker; you want the beef to cook evenly and absorb all those delicious flavors. If you’re doubling the recipe for a larger family, consider using a 6-quart or larger slow cooker so everything cooks evenly.
Step 4: Slow Cook to Tender Perfection
Now comes the easiest part—set it and forget it! Cover the slow cooker with the lid and cook on HIGH for 2–3 hours or LOW for 4–5 hours. During this time, the beef will slowly tenderize, and the sauce will thicken into a silky glaze. You don’t need to stir it often—just let the magic happen. This step by step slow cooking process is what transforms a simple cut of flank steak into melt-in-your-mouth beef that rivals your favorite takeout. While your slow cooker does its thing, take a moment to explore more cozy, set-it-and-forget-it dishes like our Crockpot Chicken Fajitas or Crockpot Chili with Ground Beef and Beans.
Step 5: Add the Green Onions for Freshness
About 10 minutes before serving, stir in the chopped green onions. This step by step finishing touch brightens the entire dish, adding a fresh pop of color and flavor that balances the rich sauce. If you prefer a bit of heat, sprinkle in red pepper flakes or add a few thin slices of fresh chili pepper at this stage. You can even toss in some steamed broccoli florets for extra texture and color.
Step 6: Serve, Garnish, and Enjoy
You’ve made it to the final step by step reward—serving your masterpiece! Spoon generous portions of the tender Mongolian beef over a bed of fluffy white rice, jasmine rice, or even noodles. Garnish with sesame seeds or extra green onions if you want to impress your dinner guests (or yourself—no judgment). The sauce should be thick, glossy, and just the right balance of sweet and savory. Pair it with a side like Red Curry Pot Sticker Soup or Savory Asian Dumpling Soup for a full-on Asian-inspired dinner night that’s cozy, comforting, and unforgettable.
Step 7: Bonus Step – Save Those Leftovers!
If you somehow have leftovers (lucky you), store them in an airtight container. They reheat beautifully and make the perfect next-day lunch. You can even serve them over quinoa or in lettuce wraps for a lighter twist. To learn how to make your slow-cooked meals last longer, check out our practical tips on storing and reheating from the Slow Cooker Boneless Turkey Breast post—it’s full of storage hacks that keep your meals tasting fresh.
What to Serve with Slow Cooker Mongolian Beef
This dish pairs beautifully with jasmine rice or brown rice, which soak up that flavorful sauce like a dream. For a lighter option, try it with steamed cauliflower rice or stir-fried vegetables. You can also serve it with a side of Ginger Garlic Chicken Soup for a comforting, full meal. If you’re in the mood for something heartier, a bowl of Pho Soup on the side creates a cozy, Asian-inspired dinner spread that rivals takeout night.
Key Tips for Making Slow Cooker Mongolian Beef
Use flank steak and slice it against the grain—that’s the secret to tender bites. Tossing it in cornstarch before cooking not only helps the sauce thicken naturally but also gives the beef a silky finish. If you prefer a deeper flavor, add a splash of rice vinegar or a dash of red pepper flakes for heat. For extra veggies, toss in broccoli florets or bell peppers during the last 30 minutes of cooking so they stay crisp-tender. And here’s a bonus trick: if you like a thicker sauce, let it simmer uncovered for the last 15 minutes.
Storage and Reheating Tips for Slow Cooker Mongolian Beef
Store leftovers in an airtight container in the refrigerator for up to four days. When reheating, warm it gently on the stove over medium heat or in the microwave for about 2 minutes. If the sauce thickens too much after chilling, add a splash of water to loosen it up. This dish also freezes well—just portion it into freezer-safe containers for up to three months. When you’re ready to eat, thaw it overnight in the fridge and reheat as usual. The flavor actually deepens after sitting for a day or two, making it a fantastic make-ahead meal.
FAQs
Can I use another cut of beef? Yes! Sirloin or skirt steak also work well, though flank steak gives the best texture.
Can I make it gluten-free? Absolutely—just swap soy sauce for tamari or coconut aminos.
Can I add veggies? Definitely. Broccoli, snow peas, or even mushrooms are great additions near the end of cooking.
Can I double the recipe? Yes, just make sure your slow cooker can handle it. Double everything, including the sauce.
Final Thoughts
Slow Cooker Mongolian Beef is proof that comfort food doesn’t have to mean complicated cooking. It’s flavorful, budget-friendly, and perfect for those days when you need dinner ready without standing over a stove. The sweet-savory sauce, the tender beef, the hands-off magic of the slow cooker—it all adds up to a family favorite you’ll make again and again.
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Slow Cooker Mongolian Beef – Easy Takeout-Style Dinner at Home
- Prep Time: 10 minutes
- Cook Time: 3 hours
- Total Time: 3 hours 10 minutes
- Yield: 5 1x
- Category: Main
- Method: Slow Cooker
- Cuisine: Asian
Description
Slow cooker Mongolian beef with thinly sliced flank steak cooked with soy sauce, brown sugar, garlic and ginger.
Ingredients
- 1 1/2 pounds flank steak, thinly sliced against the grain
- 1/4 cup cornstarch
- 1 tablespoon toasted sesame oil
- 1 teaspoon minced garlic
- 1 teaspoon minced ginger
- 1/2 cup low sodium soy sauce
- 1/3 cup brown sugar
- 1/2 cup water
- 1/2 cup green onions, cut into 1/2 inch pieces
Instructions
1. Place the flank steak in a bowl with the cornstarch and toss to coat evenly.
2. Add the flank steak to the slow cooker.
3. Place the sesame oil, garlic, ginger, soy sauce, brown sugar and water in the slow cooker. Stir to coat the meat in the sauce.
4. Cover and cook on HIGH for 2-3 hours or LOW for 4-5 hours.
5. Stir in the green onions, then serve.
Notes
For best results, slice the flank steak thinly against the grain. Serve over steamed rice or noodles for a complete meal. Adjust sweetness by reducing the brown sugar if desired.
Nutrition
- Serving Size: 1
- Calories: 308
- Sugar: 14g
- Sodium: 629mg
- Fat: 9g
- Saturated Fat: 3g
- Carbohydrates: 23g
- Protein: 30g
- Cholesterol: 81mg
