This slow cooker Mongolian beef recipe is an easy and flavorful dinner that’s perfect for busy weeknights. With tender beef, a rich, savory-sweet sauce, and minimal prep, it’s a great way to enjoy takeout-style flavors at home.
In a bowl, mix together the garlic, ginger, sesame oil, soy sauce, brown sugar, water, and black pepper. Set aside.
Add the sliced flank steak to the slow cooker and sprinkle the cornstarch on top. Stir until the meat is evenly coated.
Place the sliced onions over the beef.
Give the soy sauce mixture another stir and pour it over the meat and onions.
Cover and cook on LOW for 6-8 hours or on HIGH for 3-4 hours, until the beef becomes tender.
Stir in the green onions and dried chilis just before serving.
Sprinkle with sesame seeds and serve over white rice.
Notes
You can use other steak cuts like sirloin, skirt steak, flat iron, or chuck for this recipe. Be sure to slice against the grain into strips no thicker than ½ inch.
Cooking on low produces the most tender meat. If using high heat, keep an eye on the sauce to prevent it from thickening too much or burning.
Since slow cookers vary in temperature, if the sauce is too thin at the end of cooking, transfer some to a saucepan and simmer over medium heat until it thickens. Pour it back over the beef before serving.
For firmer onions, add them halfway through the cooking time.
To increase the heat, add the dried chilis at the beginning. For more spice, try cayenne pepper, red pepper flakes, chili crisp oil, or sriracha.