Easy Slow Cooker Mongolian Beef | Family Weeknight Dinner
The beef comes out of the slow cooker in glossy, dark strands that pull apart with a fork, the sauce thick enough to coat the back of a spoon and pooling into every rice bowl you ladle it over.
Brown sugar, soy sauce and fresh ginger build the sauce here, and this slow cooker Mongolian beef needs almost nothing from you beyond a quick sear and a slurry at the end. Make it tonight, or save the recipe for a weeknight when you want dinner to cook itself.
| Prep | Cook | Total | Servings | Difficulty |
|---|---|---|---|---|
| 15 min | 6 h 15 min | 6 h 30 min | 4 servings | Advanced |
Getting the Texture Right
Beef chuck roast, cut into strips against the grain, is what makes this dish work. The slow cooker's low, steady heat breaks down the connective tissue over hours, turning a tougher cut tender without drying it out. You'll notice the meat go from firm and springy at the start to loose and shreddy by the end, almost falling apart when you press it with a fork.
Don't skip searing the beef first in a hot skillet. Those browned edges add a roasted, slightly charred flavor that plain slow-cooked beef never develops on its own. The sauce should look thin and watery going in, then turn glossy and cling thickly once you stir in the cornstarch slurry near the end.
Slow Cooker Mongolian Beef Ingredients
Beef chuck roast turns tender after hours of low heat; flank steak works too if you want a quicker-cooking cut.
Soy sauce gives the sauce its salty, savory base; swap in coconut aminos for a lower-sodium option.
Brown sugar balances the salt with caramel sweetness; dark brown sugar adds a deeper molasses note.
Garlic and fresh ginger build the aromatic base of the sauce; ground ginger works if fresh isn't on hand.
Cornstarch thickens the sauce into a glossy coating and also helps the beef sear with a slight crust.
Beef broth thins the sauce so it can simmer evenly around the meat; low-sodium broth lets you control the salt.
Green onions add color and a sharp, fresh bite at the end; chives are a decent stand-in.
Sesame seeds finish the dish with a nutty crunch on top; toasted sunflower seeds give a similar texture.
Find exact amounts in the recipe card below.
How to Make Slow Cooker Mongolian Beef
- Sear the beef. Toss the sliced chuck in cornstarch, then brown it in batches in a hot skillet until the edges turn deep golden, about 3 minutes per side.
- Build the sauce. Whisk soy sauce, brown sugar, garlic, ginger and broth in a bowl until the sugar dissolves completely.
- Slow cook. Add the seared beef and sauce to the slow cooker, cover, and cook on low for 6 hours or high for 3 hours, until the meat shreds easily.
- Thicken the sauce. Stir a cornstarch slurry into the slow cooker and let it cook uncovered for 10-15 minutes, until the sauce turns glossy and coats a spoon.
- Finish and serve. Scatter green onions and sesame seeds over the top, then spoon the beef and sauce over steamed rice while it's still hot and bubbling.
Make It Your Own
- Swap the protein: ground beef or thinly sliced chicken thighs cook faster and absorb the sauce well; try our Best Mongolian Chicken Recipe for inspiration.
- Add vegetables: broccoli florets or sliced bell peppers stirred in during the last 20 minutes add color and crunch.
- Turn up the heat: a spoonful of chili garlic sauce or red pepper flakes gives the sauce a sharper kick.
- Go noodle-style: toss the beef and sauce with cooked noodles instead of rice, similar to our Ground Beef Mongolian Noodles.
What Can Go Wrong (and How to Fix It)
- Sauce too thin: simmer the cornstarch slurry longer, stirring, until it visibly thickens and coats a spoon.
- Beef still tough: give it another 30-60 minutes on low; chuck needs time to break down fully.
- Sauce too salty: use low-sodium soy sauce and broth, and taste before adding extra salt.
- Skipping the sear: this step builds flavor the slow cooker can't replicate, so don't leave it out even on a busy night.
- Slurry lumps: mix cornstarch with cold water first, then stir it into the hot sauce gradually.
Slow Cooker Mongolian Beef FAQ
What cut of beef works best for this recipe?
Beef chuck roast is ideal because its marbling and connective tissue break down slowly, giving you tender, shreddy meat after hours in the slow cooker.
Can I make this dish ahead of time?
The sauce and seared beef both hold well in the refrigerator for up to a day before slow cooking, which makes morning prep easy.
Why is my sauce not thickening?
The cornstarch slurry needs a few minutes of simmering uncovered to activate; stir often and give it time before adding more cornstarch.
What should I serve with slow cooker Mongolian beef?
Steamed white rice is classic, but it also works well spooned over rice noodles or alongside steamed broccoli for extra texture.
Slow Cooker Mongolian Beef
Ingredients
Method
- Coat the beef: Toss the sliced beef chuck with 1/4 cup of the cornstarch until evenly coated. This light coating helps the meat brown and later helps thicken the sauce.
- Sear in batches: Heat the oil in a large skillet over medium-high heat. Sear the beef in batches for about 3 minutes per side, until the edges turn deep golden, then transfer to the slow cooker.
- Whisk the sauce: In a bowl, whisk together the soy sauce, brown sugar, garlic, ginger and beef broth until the sugar fully dissolves.
- Pour over beef: Pour the sauce over the seared beef in the slow cooker, stirring once so every piece is coated.
- Cook low and slow: Cover and cook on low for 6 hours or on high for 3 hours, until the beef shreds easily with a fork.
- Mix the slurry: In a small bowl, whisk the remaining cornstarch with the water until smooth, with no lumps remaining.
- Thicken the sauce: Stir the slurry into the slow cooker and cook uncovered on high for 10-15 minutes, stirring occasionally, until the sauce turns glossy and coats the back of a spoon.
- Garnish and serve: Scatter the green onions and sesame seeds over the top. Spoon the beef and sauce over cooked white rice and serve hot.
More to Try
Mongolian Beef, the classic skillet version of this sweet-savory sauce.
30-Minute Mongolian Beef, a faster stovetop take for busy weeknights.
Mongolian Ground Beef: A Delightful and Delicious Dish, a budget-friendly ground beef version.
Easy Slow Cooker Beef Chili Recipe | Cozy Family Dinner, another dump-and-cook slow cooker dinner.
