Slow Cooker Korean Beef

Slow Cooker Korean Beef is a rich, savory-sweet dinner that’s incredibly easy to prepare and packed with bold flavor. Tender strips of flank steak slowly simmer in a delicious sauce made with soy sauce, brown sugar, garlic, ginger, and sesame oil. As it cooks, the beef becomes melt-in-your-mouth soft while the sauce thickens into a glossy glaze that coats every bite. This comforting dish is perfect for busy weeknights when you want something satisfying without spending hours in the kitchen. Serve it over steamed rice or noodles and garnish with green onions for a simple, hearty meal the whole family will love.

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Prep Time 15

Cook Time 2

Course: Dinner, Main Course

Cuisine: Asian, Korean

Ingredients Method Notes

Ingredients

Ingredients
1½ pounds flank steak cut into thin strips across the grain (about ¼-inch thick)
¼ cup cornstarch
1½ tablespoons sesame oil
2 teaspoons garlic finely minced
½ teaspoon fresh ginger minced
2 teaspoons rice vinegar
½ cup soy sauce
½ cup beef broth
¾ cup brown sugar
¼ teaspoon crushed red pepper flakes

Method

Step 1: Slice and Coat the Beef

Start by cutting the flank steak into thin strips across the grain. This simple step helps the meat stay tender once cooked. Place the slices in a large bowl or bag and add the cornstarch. Toss well until every strip has a light coating. The cornstarch helps the beef stay soft while also thickening the sauce later.

Step 2: Prepare the Flavorful Sauce

In a medium mixing bowl, combine soy sauce, beef broth, brown sugar, rice vinegar, sesame oil, garlic, ginger, and red pepper flakes. Whisk everything together until the sugar dissolves and the mixture becomes smooth. This sauce will bring the perfect balance of sweet, savory, and slightly spicy flavor.

Step 3: Add Everything to the Slow Cooker

Transfer the coated beef strips into the slow cooker. Pour the prepared sauce over the top and gently stir so all the meat pieces are evenly covered. This ensures every bite cooks in that delicious Korean-style sauce.

Step 4: Slow Cook Until Tender

Cover with the lid and cook on low for 4–5 hours or high for 2–3 hours. By the time it finishes cooking, the beef should be tender and coated in a rich, slightly thickened sauce. Serve hot over steamed rice or noodles and garnish with sliced green onions if desired.

Notes

Expert Tips

Cut Against the Grain
Always slice flank steak across the grain. This shortens the muscle fibers and keeps the beef tender after slow cooking.

Use Cornstarch for Texture
Lightly coating the beef with cornstarch helps create a silky sauce with a beautiful glossy finish.

Mix the Sauce Thoroughly
Make sure the brown sugar dissolves completely while whisking the sauce so the flavors distribute evenly.

Marinate for Deeper Flavor
For an even richer taste, let the sliced beef sit in the sauce for an hour or two before cooking.

Serving Suggestions

This slow cooker Korean beef pairs wonderfully with fluffy white rice or soft noodles that soak up the sweet and savory sauce.

For a complete meal, serve it with simple vegetable sides such as sautéed green beans, roasted broccoli, or stir-fried vegetables.

Leftovers also work great for meal prep. Use the beef in lettuce wraps, rice bowls, or even stuffed inside tortillas for an easy lunch.

Frequently Asked Questions

Can I freeze leftover Korean slow cooker beef?

Yes. Allow the beef to cool completely, then place it in an airtight container or freezer bag. It can be frozen for up to 3 months. Thaw overnight in the refrigerator before reheating.

Can I use another cut of beef?

Absolutely. While flank steak works beautifully, cuts such as sirloin or ribeye can also be used. Just keep an eye on cooking time since different cuts may become tender faster or slower.

How can I make this recipe gluten-free?

Simply replace the soy sauce with tamari or coconut aminos. Both options provide the same rich umami flavor without gluten.

How should I store and reheat leftovers?

Store leftover beef in a sealed container in the refrigerator for up to 4 days. Reheat gently in the microwave or on the stovetop. Add a splash of broth or water if the sauce becomes too thick.

Final Thoughts

Slow Cooker Korean Beef is one of those meals that delivers big flavor with minimal effort. The combination of soy sauce, brown sugar, garlic, and ginger creates a rich, savory-sweet sauce that slowly infuses into the beef as it cooks. The result is tender, juicy meat coated in a glossy, irresistible glaze.

It’s perfect for busy weeknights, meal prepping, or casual family dinners. Simply let the slow cooker do the work while you go about your day. Once it’s ready, serve it over rice, noodles, or fresh vegetables for a comforting meal that tastes like it came from your favorite takeout spot—only better.