Slow Cooker Mongolian Beef Recipe
Introduction
Slow Cooker Mongolian Beef is a flavorful and tender dish that’s perfect for busy days. With a rich sauce made from soy sauce, brown sugar, and aromatics, this recipe brings sweet and savory notes together effortlessly. Let your slow cooker do the work while you enjoy a comforting meal.

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, chopped (for garnish)
Instructions
- Step 1: Toss the flank steak with cornstarch in a mixing bowl until the slices are evenly coated.
- Step 2: Place the coated steak in the slow cooker. Add toasted sesame oil, minced garlic, minced ginger, soy sauce, brown sugar, and water. Stir gently to combine all ingredients.
- Step 3: Cover and cook on HIGH for 2 to 3 hours or on LOW for 4 to 5 hours, until the beef is tender.
- Step 4: Stir in the chopped green onions just before serving to add freshness and a mild crunch.
Tips & Variations
- For a thicker sauce, remove the beef when cooked and simmer the sauce on the stove top to reduce it before serving.
- Substitute flank steak with sirloin or skirt steak if preferred; just slice thinly against the grain.
- Add steamed vegetables like broccoli or snap peas for a complete meal.
Storage
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat gently in a microwave or on the stove to avoid overcooking the beef. For longer storage, freeze the beef and sauce separately for up to 3 months, then thaw overnight before reheating.
How to Serve

Serve this delicious recipe with your favorite sides.
FAQs
Can I use a different cut of beef?
Yes, sirloin or skirt steak work well for this recipe as long as they are sliced thinly against the grain for tenderness.
Do I need to brown the beef before slow cooking?
No, browning is not necessary. The slow cooker will tenderize the beef while infusing it with the flavorful sauce.
PrintSlow Cooker Mongolian Beef Recipe
This Slow Cooker Mongolian Beef recipe features tender flank steak simmered in a sweet and savory sauce made with soy sauce, brown sugar, garlic, and ginger. Perfectly cooked in a slow cooker for hours, the beef becomes incredibly flavorful and tender, garnished with fresh green onions for a burst of color and freshness. A comforting and easy-to-make dish ideal for busy weeknights.
- Prep Time: 15 minutes
- Cook Time: 2 to 3 hours on HIGH or 4 to 5 hours on LOW
- Total Time: 2 hours 15 minutes to 5 hours 15 minutes
- Yield: 4 servings 1x
- Category: Main Course
- Method: Slow Cooking
- Cuisine: Asian
Ingredients
Beef
- 1 1/2 pounds flank steak, thinly sliced against the grain
Coating
- 1/4 cup cornstarch
Sauce
- 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
Garnish
- 1/2 cup green onions, sliced
Instructions
- Coat the steak: Toss the thinly sliced flank steak with cornstarch in a mixing bowl until the pieces are evenly coated. This helps thicken the sauce and gives the beef a silky texture.
- Add ingredients to slow cooker: Place the coated steak into the slow cooker. Add toasted sesame oil, minced garlic, minced ginger, low sodium soy sauce, brown sugar, and water. Stir gently to evenly combine all ingredients without disrupting the coating on the beef.
- Cook the beef: Cover the slow cooker and cook on HIGH for 2 to 3 hours, or alternatively on LOW for 4 to 5 hours. Cook until the beef is tender and flavorful, absorbing the sweet and savory sauce.
- Finish and serve: Just before serving, stir in the sliced green onions to add freshness and a slight crunch to the dish. Serve hot over rice or your preferred side.
Notes
- For best results, slice the flank steak thinly against the grain to ensure tenderness.
- Low sodium soy sauce helps control the saltiness, but adjust according to taste.
- This recipe can be doubled or halved easily depending on your serving needs.
- If you prefer, substitute brown sugar with coconut sugar for a different flavor.
- Serve with steamed rice or noodles for a complete meal.
Keywords: Mongolian Beef, Slow Cooker Beef, Easy Asian Beef Recipe, Slow Cooker Dinner, Tender Beef Recipe, Mongolian Sauce

