Slow Cooker Flank Steak with Spicy Soy-Garlic Sauce Recipe
Introduction
This slow cooker flank steak recipe offers a tender, flavorful meal with a perfect balance of savory and spicy notes. It’s an easy dish to prepare that fills your kitchen with irresistible aromas and delivers melt-in-your-mouth steak every time.

Ingredients
- 2 pounds flank steak
- 1 onion (thinly sliced)
- 4 cloves garlic
- ½ cup low-sodium soy sauce
- ¼ cup beef broth
- 2 tablespoons tomato paste
- 2 tablespoons honey
- 1 tablespoon Worcestershire sauce
- 1 teaspoon ground coriander
- 1 teaspoon smoked paprika
- ½ teaspoon red pepper flakes (adjust to taste)
- Salt and black pepper to taste
- Fresh parsley for garnish
Instructions
- Step 1: Season the flank steak with salt and black pepper on both sides.
- Step 2: In a bowl, whisk together the soy sauce, beef broth, tomato paste, honey, Worcestershire sauce, ground coriander, smoked paprika, and red pepper flakes.
- Step 3: Place the sliced onions and garlic cloves in the bottom of the slow cooker.
- Step 4: Lay the seasoned flank steak on top of the onions and garlic.
- Step 5: Pour the prepared sauce over the steak, ensuring that it is evenly coated.
- Step 6: Cover the slow cooker and cook on low for 7-8 hours, or on high for 3-4 hours, until the steak is tender.
- Step 7: Once cooked, carefully remove the steak from the slow cooker and transfer it to a cutting board. Let it rest for a few minutes.
- Step 8: Slice the steak across the grain into thin strips.
- Step 9: Serve the savory and spicy slow cooker flank steak over a bed of creamy mashed potatoes if desired, spooning the flavorful sauce from the slow cooker over the steak.
- Step 10: Garnish with fresh parsley for a pop of color and added freshness. Enjoy!
Tips & Variations
- For extra depth, marinate the flank steak in the sauce mixture for an hour before cooking.
- Adjust the red pepper flakes according to your preferred spice level or omit for a milder dish.
- Serve with rice or crusty bread as alternatives to mashed potatoes to soak up the sauce.
- Use fresh ground coriander seeds for more vibrant flavor if available.
Storage
Store leftover steak and sauce in an airtight container in the refrigerator for up to 3 days. Reheat gently in a pan over low heat or in the microwave until warmed through, adding a splash of beef broth to maintain moisture if needed.
How to Serve

Serve this delicious recipe with your favorite sides.
FAQs
Can I use a different cut of beef?
Yes, skirt steak or sirloin steak can be good substitutes, but flank steak is preferred for its tenderness and flavor when slow cooked.
How do I know when the steak is done?
The steak is done when it is tender enough to cut easily with a fork and has reached an internal temperature of at least 145°F (63°C) for medium doneness. Slow cooking times ensure it’s tender and flavorful.
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Slow Cooker Flank Steak with Spicy Soy-Garlic Sauce Recipe
- Total Time: 7 hours 15 minutes (low) or 3 hours 45 minutes (high)
- Yield: 4 servings 1x
Description
This Slow Cooker Flank Steak recipe delivers tender, flavorful beef infused with a savory and spicy sauce, perfect for an easy and satisfying meal. The flank steak cooks slowly with a blend of soy sauce, garlic, tomato paste, and spices, resulting in a rich and aromatic dish that melts in your mouth.
Ingredients
Meat
- 2 pounds flank steak
Vegetables
- 1 onion (thinly sliced)
- 4 cloves garlic
Sauce and Seasonings
- ½ cup low-sodium soy sauce
- ¼ cup beef broth
- 2 tablespoons tomato paste
- 2 tablespoons honey
- 1 tablespoon Worcestershire sauce
- 1 teaspoon ground coriander
- 1 teaspoon smoked paprika
- ½ teaspoon red pepper flakes (adjust to taste)
- Salt and black pepper to taste
Garnish
- Fresh parsley for garnish
Instructions
- Season the steak: Season the flank steak on both sides with salt and black pepper to enhance the flavor of the meat.
- Prepare the sauce: In a bowl, whisk together the soy sauce, beef broth, tomato paste, honey, Worcestershire sauce, ground coriander, smoked paprika, and red pepper flakes until well combined.
- Layer onions and garlic: Place the thinly sliced onions and whole garlic cloves in the bottom of the slow cooker to create a flavor base for the steak.
- Arrange the steak: Lay the seasoned flank steak on top of the onions and garlic inside the slow cooker, ensuring it sits evenly.
- Add the sauce: Pour the prepared sauce evenly over the steak, making sure all the meat is coated with the flavorful mixture.
- Slow cook the steak: Cover the slow cooker and cook the steak on low heat for 7-8 hours, or on high heat for 3-4 hours, until the meat becomes tender and infused with flavors.
- Rest the steak: Carefully remove the cooked steak from the slow cooker and transfer it to a cutting board. Let it rest for a few minutes to retain juices.
- Slice the steak: Slice the flank steak thinly across the grain into strips, which helps keep the meat tender when served.
- Serve: Serve the sliced flank steak over creamy mashed potatoes or your choice of side, spooning the flavorful sauce from the slow cooker over the meat.
- Garnish and enjoy: Garnish the dish with fresh parsley for a burst of color and freshness before enjoying your delicious slow cooker flank steak.
Notes
- For best results, slice the steak thinly against the grain to ensure tenderness.
- You can adjust the amount of red pepper flakes to control the spiciness level to your preference.
- Leftover steak can be refrigerated for up to 3 days and reheated gently to avoid drying out the meat.
- This recipe pairs wonderfully with creamy mashed potatoes, steamed vegetables, or rice.
- Using low-sodium soy sauce helps manage the salt content without compromising flavor.
- Prep Time: 15 minutes
- Cook Time: 7 hours (low) or 3.5 hours (high)
- Category: Main Course
- Method: Slow Cooking
- Cuisine: American
Keywords: slow cooker flank steak, slow cooked beef, flank steak recipe, easy dinner, tender flank steak, soy sauce beef

