Slow Cooker Mongolian Beef
An easy, hands-off recipe for Mongolian beef with a sticky brown sugar-soy glaze served over rice, perfect for busy weeknight dinners.
I’ve been making this slow-cooker Mongolian-style beef for years whenever I want a hands-off weekday dinner that still tastes like restaurant takeout. The brown sugar–soy glaze gets sticky and rich while the flank steak turns tender but not mushy — perfect over a mound of steamed rice. If you’re looking for an easy family meal that comes together with minimal hands-on time, this is one to keep in your rotation; I originally adapted it from a favorite online version and trimmed a couple of steps for busy evenings. For a slightly different take later, compare notes with this slow cooker Mongolian beef recipe on RecipeSmoke.
Why you’ll love this dish
This recipe hits the sweet-salty balance that makes Mongolian beef a crowd-pleaser without the fuss of deep-frying or high-heat stir-frying. It’s ideal for weeknight dinners, meal prep for the week, or when you want a comforting, saucy dish to serve over rice. Benefits at a glance:
- Hands-off cooking: toss everything in and walk away.
- Budget-friendly: flank steak is economical compared with pricier cuts and becomes tender in the slow cooker.
- Kid-friendly flavor: the sweet brown sugar glaze and mild aromatics appeal to picky eaters.
- Easily scalable: double the sauce without changing cook time.
The cooking process explained
Before you start, here’s the simple flow so you know what to expect:
- Slice flank steak against the grain and cube it — coating with cornstarch helps the sauce cling and thickens the final glaze.
- Whisk aromatics (ginger, garlic) into a soy–brown sugar sauce with a splash of oils and water.
- Toss beef and sauce together in the slow cooker. Cook low and slow (or speed it up on high).
- Finish by stirring, spooning the glossy sauce over rice, and garnishing with scallions and sesame seeds.
This overview should take the mystery out of the timeline: active time is mostly prep (15–20 minutes). The slow cooker handles the rest.
What you’ll need
- 1 pound flank steak — slice against the grain, then cut into 1-inch cubes.
- 1/4 teaspoon salt
- 1/8 teaspoon black pepper
- 1/4 cup cornstarch — helps lock in juices and thickens the sauce. (Arrowroot is a 1:1 substitute for gluten-free.)
- 1-inch piece fresh ginger, peeled and minced
- 3 garlic cloves, minced
- 1/2 cup reduced-sodium soy sauce — reduced-sodium keeps the glaze from becoming overly salty. Tamari works for gluten-free.
- 1/3 cup brown sugar — light or dark both work; dark gives a deeper molasses note.
- 1/4 cup water — thins the sauce so it simmers into a glaze.
- 2 tablespoons vegetable oil — neutral oil for the sauce.
- 1 tablespoon sesame oil — adds toasty flavor.
- 4 scallions (green onions), sliced and divided — half goes into the cooking liquid; the rest for garnish.
- Steamed white rice, for serving — jasmine or short-grain are classic.
- Toasted sesame seeds, for garnish
Notes: If you prefer a leaner cut, top round works but may be slightly less tender. For a slightly thicker final sauce, increase cornstarch by 1–2 tablespoons, but don’t overdo it or the sauce can become gummy.
Step-by-step instructions
- Trim any excess fat from the flank steak. Slice across the grain into thin strips and then cut into 1-inch cubes. Put the beef into a large mixing bowl.
- Season with 1/4 teaspoon salt and 1/8 teaspoon pepper. Add 1/4 cup cornstarch and toss until the meat is evenly coated. Set aside so the cornstarch can adhere.
- Mince the ginger and garlic finely so their flavors disperse in the sauce.
- In a second bowl, whisk together minced ginger, minced garlic, 1/2 cup reduced-sodium soy sauce, 1/3 cup brown sugar, 1/4 cup water, 2 tablespoons vegetable oil, 1 tablespoon sesame oil, and half the sliced scallions.
- Pour the sauce over the coated beef and toss until every piece is well-coated. The cornstarch will start to absorb the sauce — that’s intentional.
- Transfer everything (meat and sauce) to the bottom of the slow cooker and spread into an even layer.
- Cook on high for 2.5 hours, or on low for 4–5 hours. At the end of cooking, stir the beef so the sauce coats the meat and any pooled juices thicken slightly.
- Serve the beef over scoops of steamed white rice. Garnish with the remaining sliced scallions and a sprinkle of toasted sesame seeds.
Short, focused actions and a single bowl for the sauce makes cleanup easy. If your slow cooker runs hot, check around the 3-hour mark on low to prevent overcooking.
Slow-Cooker Mongolian-Style Beef
- Prep
- 20 MIN
- Cook
- 5 HRS
- Total
- 5 HRS 20 MIN
- Serves
- 4
01Ingredients
Main Ingredients
02Method
- Preparation
- Cooking
Tap a step when it's done. The next one lights up.
0 OF 8 DONE03Recipe notes
- 01For a slightly thicker final sauce, increase cornstarch by 1–2 tablespoons but don’t overdo it or the sauce can become gummy. Refrigerate leftovers in an airtight container for 3–4 days.
04Nutrition
Per serving- Calories
- 387
- Protein
- 27G
- Net carbs
- 28G
- Fat
- 19G
- Fiber
- 0G
Net carbs are total carbs minus fiber. Numbers are estimates from the ingredients listed.
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Best ways to enjoy it
- Classic serving: a generous scoop of beef and glossy sauce over steamed white rice with scallions and sesame seeds.
- Noodle bowl: toss over udon or lo mein noodles and add steamed broccoli.
- Bowl upgrade: add a soft-boiled egg, quick-pickled cucumbers, and shredded carrots for texture.
- Lettuce wraps: spoon cooled beef into butter lettuce leaves for a lighter, low-carb option.
- For spice: add a teaspoon of chili garlic sauce to the sauce mix, or finish with a few red pepper flakes.
Storage and reheating tips
Refrigerate: Transfer cooled leftovers to an airtight container and refrigerate for up to 3–4 days.
Freeze: Place cooled beef and sauce in a freezer-safe container for up to 3 months. Thaw overnight in the fridge before reheating.
Reheat on the stovetop over medium-low, stirring occasionally so the sauce doesn’t burn; add a splash of water if the sauce has thickened too much. Alternatively, reheat gently in the microwave in 30–45 second bursts, stirring between intervals.
Food safety: don’t leave cooked beef at room temperature for more than 2 hours. Reheat leftovers to an internal temperature of 165°F (74°C) before serving.
Recipe variations
- Spicy Mongolian: stir 1–2 teaspoons of Sriracha or chili garlic sauce into the sauce mix.
- Citrus twist: add 1 tablespoon rice vinegar and 1 teaspoon orange zest for brightness.
- Lower sugar: swap half the brown sugar for a sugar substitute like allulose or reduce the amount to 1/4 cup, but expect slightly less gloss.
- Make it with chicken or tofu: use boneless skinless chicken thighs (cut into 1-inch pieces) and reduce cook time to 3–4 hours on low; for tofu, use extra-firm, press it well, and add in the last hour to avoid crumbling.
- Gluten-free version: use tamari instead of soy sauce and arrowroot in place of cornstarch.
Helpful answers
How long does prep take, really?
Plan on 15–20 minutes for trimming, slicing, and mixing the sauce. Most of the time is hands-off in the slow cooker.
Can I use a different cut of beef?
Yes. Flank steak is ideal for tenderness and flavor, but skirt steak, sirloin, or top round work; adjust cook time slightly and slice carefully against the grain.
Will the cornstarch make the beef gummy?
If you use the suggested 1/4 cup and coat the meat evenly, it will create a glossy, clingy sauce — not gummy. Overusing starch or letting the sauce boil aggressively can create a pasty texture.
Is this recipe freezer-friendly?
Yes. Fully cooked beef freezes well for up to 3 months. Thaw overnight in the fridge and reheat gently.
Can I make this on the stovetop?
Yes — simmer the sauce with cooked beef in a skillet until it thickens and coats the meat. For stovetop timing, sear the beef first and simmer 10–15 minutes until sauce reduces.
Conclusion
If you want a dependable, hands-off takeout-style meal that’s easy to scale and kid-friendly, this slow-cooker Mongolian-style beef delivers flavor with minimal fuss. For another well-loved version to compare techniques and timing, see this detailed recipe from Slow Cooker Mongolian Beef – Dinner at the Zoo. For another idea, try my Slow Cooker Mongolian Beef.
Crockpot & Slow Cooker
Crockpot & Slow Cooker
Crockpot & Slow Cooker
