Slow Cooker Flank Steak with Spicy Soy Sauce and Garlic Recipe
Introduction
This slow cooker flank steak recipe is an effortless way to enjoy tender, flavorful beef infused with a savory and slightly spicy sauce. Perfect for busy days, it requires minimal prep and delivers rich, comforting results that pair wonderfully with mashed potatoes or rice.

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, 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 an extra depth of flavor, marinate the steak in the sauce mixture for an hour before cooking.
- If you prefer less heat, reduce or omit the red pepper flakes.
- Try adding sliced bell peppers or mushrooms to the slow cooker for added vegetables.
- Use this flank steak in tacos or sandwiches with the leftover sauce for a delicious twist.
Storage
Store leftover flank steak and sauce in an airtight container in the refrigerator for up to 3 days. Reheat gently in a skillet or microwave until warmed through. For longer storage, freeze portions for up to 2 months and thaw overnight in the fridge before reheating.
How to Serve
Serve this delicious recipe with your favorite sides.
FAQs
Can I use a different cut of beef?
Yes, you can substitute flank steak with skirt steak or sirloin, but adjust cooking times as these cuts vary in thickness and tenderness.
How do I know when the steak is done?
The steak is done when it is tender and easily pierced with a fork, typically after 7-8 hours on low or 3-4 hours on high in the slow cooker.
PrintSlow Cooker Flank Steak with Spicy Soy Sauce and Garlic Recipe
This Slow Cooker Flank Steak recipe delivers tender, flavorful beef infused with a rich and spicy sauce made from soy sauce, tomato paste, and aromatic spices. Perfect for an effortless, hands-off meal that melts in your mouth, it pairs beautifully with creamy mashed potatoes or your favorite side dish.
- Prep Time: 15 minutes
- Cook Time: 7 hours (low) or 3.5 hours (high)
- Total Time: 7 hours 15 minutes (low) or 3 hours 45 minutes (high)
- Yield: 4 servings 1x
- Category: Main Course
- Method: Slow Cooking
- Cuisine: American
Ingredients
Main Ingredients
- 2 pounds flank steak
- 1 onion (thinly sliced)
- 4 cloves garlic
Sauce Ingredients
- 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 for desired level of spiciness)
- Salt and black pepper to taste
Garnish
- Fresh parsley for garnish
Instructions
- Season the Steak: Pat the flank steak dry and season both sides generously with salt and black pepper to enhance the meat’s natural flavor.
- Prepare the Sauce: In a medium bowl, whisk together the soy sauce, beef broth, tomato paste, honey, Worcestershire sauce, ground coriander, smoked paprika, and red pepper flakes until smooth and well combined.
- Layer the Slow Cooker: Place the thinly sliced onions and whole garlic cloves in the bottom of the slow cooker, creating a flavorful base for the steak.
- Add the Steak: Lay the seasoned flank steak over the onions and garlic, ensuring even placement for consistent cooking.
- Pour Sauce Over: Pour the prepared sauce over the steak, making sure it is evenly coated to infuse the meat with flavor during cooking.
- Slow Cook the Steak: Cover the slow cooker and cook on low heat for 7-8 hours or on high for 3-4 hours, until the flank steak becomes tender and easily pulls apart.
- Rest the Meat: Carefully remove the steak from the slow cooker and place it on a cutting board. Allow it to rest for a few minutes to redistribute juices.
- Slice Against the Grain: Slice the steak thinly against the grain to ensure tenderness in every bite.
- Serve: Serve the thinly sliced steak over a bed of creamy mashed potatoes or your preferred side, spooning the flavorful sauce from the slow cooker over the top.
- Garnish and Enjoy: Add a sprinkle of fresh parsley for a fresh pop of color and flavor before serving. Enjoy your comforting, savory meal!
Notes
- Adjust the red pepper flakes to your preferred spice level.
- For even more tender meat, cook on low for the full 8 hours.
- Letting the steak rest after cooking helps retain its juices.
- Slicing against the grain is key for tenderness.
- Serve with mashed potatoes, rice, or steamed vegetables for a complete meal.
Keywords: slow cooker flank steak, slow cooked beef, flank steak recipe, easy beef recipe, tender flank steak, savory slow cooker meals

