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Savory Slow Cooker Mongolian Beef Recipe with Sticky Garlic Sauce

slow cooker Mongolian beef - featured image

A flavorful and easy slow cooker Mongolian beef recipe featuring a sticky garlic sauce that balances sweet, salty, and garlicky flavors. Perfect for busy weeknights and cozy dinners.

Ingredients

Scale
  • 2 pounds flank steak or sirloin, thinly sliced against the grain
  • 6 cloves garlic, minced
  • 1 tablespoon fresh grated ginger
  • 1/2 cup low sodium soy sauce
  • 1/3 cup packed brown sugar
  • 1/2 cup water
  • 2 tablespoons cornstarch mixed with 2 tablespoons cold water
  • 1 tablespoon vegetable oil (optional, for searing)
  • 3 stalks green onions, sliced thinly
  • 1/4 teaspoon red pepper flakes (optional)
  • 1 tablespoon toasted sesame seeds

Instructions

  1. Trim any excess fat from the flank steak and slice thinly against the grain into strips about 1/4 inch thick. (10 minutes)
  2. In a medium bowl, whisk together soy sauce, brown sugar, water, minced garlic, grated ginger, and red pepper flakes (if using). Set aside. (5 minutes)
  3. Optional: Heat vegetable oil in a skillet over medium-high heat. Quickly sear the beef strips in batches for about 1 minute per side until browned but not cooked through. (10 minutes)
  4. Place the sliced beef in the slow cooker. Pour the sauce mixture over the beef, stirring gently to coat all pieces evenly. (5 minutes)
  5. Cover and cook on low for 4 hours or on high for 2 hours, until beef is tender and infused with sauce flavors. Avoid lifting the lid too often. (2-4 hours)
  6. About 15 minutes before serving, mix cornstarch with cold water until smooth. Stir the slurry into the slow cooker and cook on high uncovered for 10-15 minutes until the sauce thickens to a sticky glaze consistency. (15 minutes)
  7. Sprinkle sliced green onions and toasted sesame seeds on top before serving. Serve hot over steamed rice or noodles. (5 minutes)

Notes

Searing the beef before slow cooking adds extra flavor but is optional. Use tamari instead of soy sauce for a gluten-free version. Adjust saltiness by adding water or honey if sauce is too salty. Stir gently after adding cornstarch slurry to keep beef strips intact.

Nutrition

Keywords: Mongolian beef, slow cooker, sticky garlic sauce, easy dinner, beef recipe, savory, slow cooker beef