Slow Cooker Mongolian Beef is a dish that has transformed my family dinners. The melt-in-your-mouth beef, coated in a savory, slightly sweet sauce, makes every bite a delightful experience. Whether you’re hosting a gathering or enjoying a quiet night in, this dish shines in any setting. Let’s dive into creating this delicious meal!
Why You’ll Love This Slow Cooker Mongolian Beef
There are countless reasons to fall in love with this slow-cooked Mongolian beef recipe. First, it is incredibly easy to prepare, making it perfect for busy weeknights. Second, the use of a slow cooker means you’ll have tender Mongolian beef in a crockpot that practically cooks itself while you go about your day. Third, the flavor profile is outstanding, combining the sweetness of brown sugar with the savory notes of soy sauce and hoisin. Additionally, it’s a healthy option, especially when served with vegetables and rice. Lastly, you can customize it to your liking by adding different vegetables or spices!

Ingredients for Slow Cooker Mongolian Beef
Gather these items:
- 1 ½ pounds flank steak (or sirloin), thinly sliced against the grain
- ¼ cup soy sauce (low-sodium preferred)
- ¼ cup hoisin sauce
- ½ cup brown sugar, packed
- 2 tablespoons rice vinegar
- 1 tablespoon garlic, minced
- 1 tablespoon fresh ginger, minced
- 2 tablespoons cornstarch
- ¼ cup water
- 2 tablespoons sesame oil
- 3 green onions, chopped (for garnish)
- Optional: 1 tablespoon crushed red pepper flakes (for a spicy kick)
How to Make Slow Cooker Mongolian Beef Step-by-Step
- Step 1: Slice the flank steak against the grain into thin strips for maximum tenderness.
- Step 2: In a bowl, whisk together the soy sauce, hoisin sauce, brown sugar, rice vinegar, minced garlic, and minced ginger. Stir until the sugar has dissolved and the sauce is well combined.
- Step 3: Place the sliced beef into the slow cooker. Pour the sauce over the beef, ensuring it is evenly coated. Stir everything together to ensure the beef is fully submerged.
- Step 4: Cover the slow cooker with the lid and cook on low for 4-5 hours or high for 2-3 hours. The beef should be tender and fully cooked.
- Step 5: Once the beef is cooked, mix cornstarch and water to create a slurry. Add it to the slow cooker and cook for an additional 20-30 minutes, allowing the sauce to thicken.
- Step 6: Garnish with chopped green onions and serve over steamed rice or noodles. Add crushed red pepper flakes for an extra spicy kick.

Pro Tips for the Best Slow Cooker Mongolian Beef
Keep these in mind:
- Always slice the beef against the grain for tenderness.
- For added depth of flavor, consider marinating the beef in the sauce overnight.
- Use low-sodium soy sauce to control the saltiness in the dish.
- This recipe is gluten-free, making it a healthy option for those with dietary restrictions.
Best Ways to Serve Slow Cooker Mongolian Beef
There are multiple ways to enjoy this dish. Serving it over steamed rice is a classic choice, but you can also pair it with noodles for a satisfying meal. For a healthier twist, serve it with a side of stir-fried vegetables or a fresh salad.
How to Store and Reheat Slow Cooker Mongolian Beef
To store leftovers, place them in an airtight container in the refrigerator for up to 3 days. When you’re ready to eat, simply reheat the beef in the microwave or on the stovetop. For meal prep, consider doubling the recipe and freezing portions for later!
Frequently Asked Questions About Slow Cooker Mongolian Beef
What’s the secret to perfect Slow Cooker Mongolian Beef?
The key to perfect Mongolian beef in slow cooker is slicing the meat thinly and against the grain. This ensures maximum tenderness during cooking.
Can I make Slow Cooker Mongolian Beef ahead of time?
Yes, this easy slow cooker Mongolian beef recipe can be made in advance. Simply prepare it, let it cool, and store it in the refrigerator or freezer for later use.
How do I avoid common mistakes with Slow Cooker Mongolian Beef?
To avoid common mistakes, ensure that you follow the cooking times closely and don’t skip the thickening step with cornstarch, as it adds a delicious body to the sauce.
Variations of Slow Cooker Mongolian Beef You Can Try
Feel free to experiment with this dish! You can add vegetables like bell peppers or broccoli for extra nutrition. For a spicy kick, include more crushed red pepper flakes or serve it with a spicy Mongolian beef sauce for slow cooking.
For more delicious recipes, check out Slow Cooker Beef Ramen or Crockpot Butter Chicken. If you’re interested in other slow cooker options, visit our last recipes for more inspiration!
Print
Slow Cooker Mongolian Beef: 5 Secrets to Perfection
- Total Time: 4 hours 15 minutes
- Yield: 4 servings 1x
- Diet: Gluten Free
Description
Slow Cooker Mongolian Beef – melt-in-your-mouth beef in a savory, slightly sweet sauce. Perfect for any occasion!
Ingredients
- 1 ½ pounds flank steak (or sirloin), thinly sliced against the grain
- ¼ cup soy sauce (low-sodium preferred)
- ¼ cup hoisin sauce
- ½ cup brown sugar, packed
- 2 tablespoons rice vinegar
- 1 tablespoon garlic, minced
- 1 tablespoon fresh ginger, minced
- 2 tablespoons cornstarch
- ¼ cup water
- 2 tablespoons sesame oil
- 3 green onions, chopped (for garnish)
- Optional: 1 tablespoon crushed red pepper flakes (for a spicy kick)
Instructions
- Slice the flank steak against the grain into thin strips for maximum tenderness.
- In a bowl, whisk together the soy sauce, hoisin sauce, brown sugar, rice vinegar, minced garlic, and minced ginger. Stir until the sugar has dissolved and the sauce is well combined.
- Place the sliced beef into the slow cooker. Pour the sauce over the beef, ensuring it is evenly coated. Stir everything together to ensure the beef is fully submerged.
- Cover the slow cooker with the lid and cook on low for 4-5 hours or high for 2-3 hours. The beef should be tender and fully cooked.
- Once the beef is cooked, mix cornstarch and water to create a slurry. Add it to the slow cooker and cook for an additional 20-30 minutes, allowing the sauce to thicken.
- Garnish with chopped green onions and serve over steamed rice or noodles. Add crushed red pepper flakes for an extra spicy kick.
Notes
- Prep Time: 15 minutes
- Cook Time: 4 hours
- Category: Main Dish
- Method: Slow Cooker
- Cuisine: Asian
Nutrition
- Serving Size: 1 serving
- Calories: 300
- Sugar: 20g
- Fat: 15g
- Carbohydrates: 28g
- Protein: 20g
Keywords: Slow Cooker Mongolian Beef, Mongolian Beef, Slow Cooker Recipe