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Easy Tender Crockpot Mongolian Beef Recipe with Green Onions Made Perfect

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A simple and flavorful crockpot Mongolian beef recipe that delivers tender, juicy beef coated in a sweet-savory sauce with fresh green onions. Perfect for busy weeknights and fuss-free cooking.

Ingredients

Scale
  • 1.5 pounds flank steak, thinly sliced against the grain
  • ½ cup soy sauce (low-sodium preferred)
  • ½ cup brown sugar
  • ¼ cup water
  • 2 tablespoons cornstarch
  • 2 teaspoons minced garlic
  • 1 teaspoon freshly grated ginger
  • 1 tablespoon hoisin sauce (optional)
  • 4–5 green onions, thinly sliced (separate white and green parts)
  • 1 tablespoon vegetable or canola oil
  • Optional: thinly sliced bell pepper or snap peas
  • Optional: ½ teaspoon red pepper flakes or diced fresh chili for spice

Instructions

  1. Partially freeze the flank steak for about 30 minutes to make slicing easier. Slice into thin strips about ¼ inch thick against the grain.
  2. In a mixing bowl, whisk together soy sauce, brown sugar, water, cornstarch, minced garlic, grated ginger, and hoisin sauce if using until cornstarch is fully dissolved.
  3. Heat oil in a small skillet over medium heat. Add the white parts of the green onions, garlic, and ginger and sauté for 1-2 minutes until fragrant but not browned. This step is optional.
  4. Transfer the sliced beef to the crockpot. Pour the sauce over the beef and add the sautéed aromatics. Stir gently to coat evenly.
  5. Cover and cook on low for 4 hours or until beef is tender. Avoid lifting the lid during cooking.
  6. About 15 minutes before serving, stir in the green parts of the sliced green onions.
  7. If the sauce is thinner than desired, mix 1 teaspoon cornstarch with 1 tablespoon cold water and stir into the crockpot. Cook for another 10-15 minutes until thickened.
  8. Serve hot over steamed rice, noodles, or cauliflower rice. Garnish with extra green onions if desired.

Notes

Partially freezing the flank steak makes slicing easier and helps keep the beef tender. Sautéing garlic, ginger, and white parts of green onions enhances flavor but can be skipped for a quicker prep. Avoid lifting the crockpot lid during cooking to maintain heat. Adjust sauce thickness at the end with cornstarch slurry. For gluten-free, use tamari instead of soy sauce and ensure hoisin sauce is gluten-free or omit it. Add red pepper flakes for spice if desired.

Nutrition

Keywords: Mongolian beef, crockpot recipe, slow cooker, easy dinner, beef recipe, green onions, weeknight meal, tender beef, sweet-savory sauce

Find it online: https://tastypierecipes.com/easy-tender-crockpot-mongolian-beef-recipe-with-green-onions-made-perfect/