Too tired to cook something complicated after a long day? This 5-ingredient slow cooker Mongolian beef is the ultimate “better than takeout” hack for your busiest nights.
You can have melt-in-your-mouth tender beef waiting for you without any heavy lifting. This recipe is useful right now for anyone craving bold, savory flavors with almost zero effort.
Why You’ll Make This 5-Ingredient Slow Cooker Mongolian Beef Again
This dish is a perfect fit for Fall because it is pure comfort food. It is a family-friendly staple that turns a simple flank steak into a gourmet meal. You will love how the sweet and savory garlic-soy glaze thickens perfectly in the pot. This recipe is a guaranteed weeknight winner that only takes 10 minutes to prep.
Because it only uses 5 main ingredients, it is the ultimate budget-friendly luxury. It is ideal for meal prep because the beef stays succulent and flavorful for days. You get consistent, restaurant-quality results every single time you hit the start button. Once you try this glossy sauce, you will delete your favorite takeout app for good.
How This Comes Together
You start by tossing thin strips of steak in cornstarch to ensure a velvety texture. The sauce builds itself as the sugar and soy sauce simmer with the beef. A few hours on low heat creates a rich, dark glaze that clings to every bite. Beginners will love how foolproof and simple it is to get that iconic sticky finish.
What You’ll Need
You only need five basic pantry staples to create this addictive Asian-inspired meal. These ingredients work together to build a deeply savory profile that everyone will love.
- 1.5 lbs flank steak (sliced thin against the grain)
- 1/4 cup cornstarch
- 1/2 cup soy sauce
- 1/2 cup brown sugar
- 1 tbsp minced garlic
- 1/2 cup water
- Green onions (for garnish)
Step-by-Step Directions
- Coat the sliced beef strips in cornstarch until they are evenly and lightly dusted.
- Place the beef into the bottom of your slow cooker in a single layer.
- Whisk the soy sauce, brown sugar, garlic, and water in a small jar.
- Pour the liquid over the beef and stir gently to combine everything.
- Cook on LOW for 4 to 5 hours until the meat is incredibly tender.
- Stir the pot once halfway through to help the glaze thicken evenly.
- Serve hot over a bed of rice once the sauce is thick and glossy.
- Garnish with plenty of fresh green onions for a bright, crisp finish.
How to Serve It
Serve this 5-ingredient slow cooker Mongolian beef over fluffy white rice or rice noodles. It looks incredible when the dark mahogany beef is topped with vibrant green onions. Pair it with steamed broccoli or a quick sesame slaw for a fresh Fall balance. For a quick weeknight dinner, it is a complete and satisfying one-pot meal. Your family will love how the sticky sauce coats every grain of rice.
Leftovers & Storage
This beef is a meal prep dream because it reheats beautifully without getting tough. Store leftovers in an airtight container in the fridge for up to 4 days. You can freeze the cooked beef in its sauce for up to 2 months. Reheat it in a skillet with a splash of water to loosen the glaze. It makes the best desk lunch that all your coworkers will envy.
Make It Even Better (Pro Tips)
- Don’t skip the cornstarch: It is the secret to that velvety, thick takeout texture.
- Cut against the grain: Slicing the steak this way ensures the beef is melt-in-your-mouth tender.
- Mistake to avoid: Avoid using high heat if possible; low and slow is best for flank steak.
- Time-saving tip: Slice your beef while it is slightly frozen for perfectly thin strips.
- Occasion tip: For casual hosting, serve with a side of crispy spring rolls.
- Upgrade tip: Add a tablespoon of fresh ginger for a more complex flavor profile.
- Substitution: Use tamari instead of soy sauce to make this recipe gluten-free.
Easy Ways to Change It Up
- Spicy Mongolian: Add one teaspoon of red pepper flakes for a gentle heat.
- Veggie Packed: Add sliced red bell peppers during the last hour of cooking.
- Fall Variation: Stir in some shredded carrots for extra sweetness and seasonal color.
- Sesame Style: Sprinkle with toasted sesame seeds just before serving for extra crunch.
Quick Questions
Can I use a different cut of beef?
While flank steak is traditional, you can also use sirloin tips or flat iron steak. Just ensure you slice them thin so they cook quickly and stay tender.
Why is my sauce too thin?
The sauce needs time to emulsify with the cornstarch. If it is still thin, cook it uncovered on HIGH for 15 minutes before serving.
I hope this Mongolian beef makes your busy week feel a little more luxurious. There is nothing better than a 5-ingredient meal that tastes this decadent!
— Sophie
5-Ingredient Slow Cooker Mongolian Beef
Ingredients
Method
- Place the sliced flank steak strips into a large Ziploc bag or bowl with the cornstarch. Toss until every piece is lightly and evenly coated.
- Add the coated beef strips into the bottom of your slow cooker.
- In a small jar or bowl, whisk together the soy sauce, brown sugar, minced garlic, and water until the sugar is mostly dissolved.
- Pour the sauce mixture over the beef in the slow cooker and stir gently to combine.
- Cover and cook on LOW for 4-5 hours (or HIGH for 2-3 hours) until the beef is succulent and tender.
- The sauce will naturally thicken from the cornstarch as it cooks, creating a rich, glossy glaze.
- Stir once more before serving to coat the beef in all that delicious sauce.
- Serve hot over rice and garnish generously with fresh green onions.
