Ultimate Slow Cooker Mongolian Beef

The first time my roommate walked in while this was simmering, she actually stopped dead in her tracks and asked what restaurant I'd ordered from. That rich, caramelized soy-ginger aroma fills the whole house and lingers in the best way possible.

I made this for a Tuesday night dinner with friends last fall when nobody had energy to cook properly. We ended up standing around the slow cooker, just dipping spoons into the sauce and talking for an hour before actually sitting down to eat.

Ingredients

• Flank steak: Slice it thin against the grain and this economical cut transforms into something luxurious
• Low-sodium soy sauce: Regular soy sauce makes the final dish too salty since the sauce reduces
• Brown sugar: Creates that gorgeous glossy coating and deep caramel flavor
• Hoisin sauce: The secret ingredient that gives restaurant-style depth and complexity
• Fresh ginger: Dont even think about using the powdered stuff here
• Cornstarch: Coating the beef first keeps it silky, while the slurry thickens the sauce perfectly

Instructions

Make the sauce:

Whisk together the soy sauce, brown sugar, water, hoisin, sesame oil, garlic, ginger, and red pepper flakes until the sugar completely dissolves.

Coat the beef:

Toss the sliced steak with cornstarch in a zip-top bag until every piece is lightly dusted, then shake off any excess.

Start the slow cooking:

Arrange the coated beef in your slow cooker and pour that gorgeous sauce all over it, giving everything a gentle stir.

Thicken the sauce:

Whisk together the cornstarch and cold water, then stir it into the slow cooker during the last 30 minutes of cooking.

Finish and serve:

Spoon the beef and that thickened glossy sauce over steaming rice, then sprinkle generously with green onions and sesame seeds.

Save

My sister-in-law now requests this every single time she visits, and she's not someone who typically asks for seconds. Something about that combination of salty-sweet with just enough heat keeps everyone coming back for more.

Make It Your Own

throw in sliced bell peppers or carrots during the last hour if you want some vegetables in the mix. They soak up all that sauce while staying tender-crisp.

Serving Suggestions

Steamed jasmine rice is classic, but Ive also served this over wide rice noodles or even cauliflower rice for a lighter version. The sauce makes anything taste incredible.

Meal Prep Magic

This actually tastes even better the next day as the flavors continue to develop. I always make extra because the leftovers reheat beautifully for lunch.

• Store the beef and sauce separately from the rice for the best texture
• Add a splash of water when reheating if the sauce has thickened too much
• The garnishes stay crisp if you pack them separately and add right before eating

Save

There's something deeply satisfying about a meal that tastes like it came from a restaurant but required almost zero active cooking time.

Recipe FAQs

→ What type of beef works best for this dish?

Flank steak is ideal as it becomes incredibly tender when slow-cooked. Make sure to slice it thinly across the grain for the best texture.

→ Can I make this gluten-free?

Yes! Simply substitute tamari for soy sauce and use a certified gluten-free hoisin sauce. The dish will maintain its delicious flavor profile.

→ How do I prevent the sauce from being too sweet?

The brown sugar creates the signature sweet-savory balance. If you prefer less sweetness, reduce the amount to 1/2 cup or taste and adjust during cooking.

→ What vegetables can I add to this dish?

Sliced carrots or bell peppers work well. Add them with the beef at the beginning so they cook through and absorb the flavors.

→ Can I make this on the stovetop instead?

While possible, the slow cooker method creates the most tender results. For stovetop, brown the beef first, then simmer in sauce for 1-2 hours until tender.