Slow Cooker Flank Steak

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slow cooker flank steak is my go to dinner for those days when I want something that tastes like I tried way harder than I actually did. You know the kind of day, where you are answering emails, doing laundry, and suddenly it is almost dinner time. This recipe saves me every single time because the prep is quick, and the slow cooker does the heavy lifting. The steak comes out tender, juicy, and full of that cozy, savory flavor that makes everyone hover around the kitchen. If flank steak has ever turned out a little chewy for you, this method is the fix.

How to Make Slow Cooker Flank Steak

I like this recipe because it is straightforward and forgiving. It is also super flexible, so you can use what you have. I usually aim for a bold, simple flavor that works for bowls, sandwiches, and tacos all week long.

What you will need

• Flank steak (about 2 to 2.5 pounds)
• 1 large onion, sliced
• 3 to 4 cloves garlic, minced
• 1 cup beef broth (or stock)
• 2 tablespoons soy sauce
• 2 tablespoons Worcestershire sauce
• 1 tablespoon tomato paste (optional, but it adds richness)
• 1 tablespoon brown sugar or honey
• 1 teaspoon smoked paprika
• 1 teaspoon salt, plus more to taste
• 1/2 teaspoon black pepper
• 1 tablespoon cornstarch mixed with 2 tablespoons cold water (optional, for thickening)
• Fresh parsley or cilantro for serving

I’ve made similar comforty slow cooker meals like delicious slow cooker beef and noodles, and the vibe is the same: simple ingredients, big payoff, and lots of happy sighing at the table.

Step by step directions

Here is how I make it at home, no fuss:

1) Layer the sliced onion in the bottom of your slow cooker. This is like a little cushion for the meat and it adds flavor too.

2) Pat the flank steak dry with paper towels, then rub it with salt, pepper, and smoked paprika. If you have two extra minutes, give it a quick sear in a hot pan with a little oil, about 1 to 2 minutes per side. This step is optional, but it adds a deeper flavor.

3) Place the steak on top of the onions. Add garlic around it.

4) In a bowl, whisk together broth, soy sauce, Worcestershire, tomato paste, and brown sugar. Pour it over the steak.

5) Cook on LOW for 7 to 8 hours or HIGH for 3.5 to 4.5 hours. I prefer LOW because it gives that super tender pull apart texture.

6) When it is done, move the steak to a cutting board and let it rest 5 to 10 minutes. Then slice or shred, depending on how you want to serve it.

7) If you want a thicker sauce, stir the cornstarch slurry into the liquid in the slow cooker, cover, and cook on HIGH for 10 to 15 minutes until it thickens a bit.

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If you are in a full slow cooker mood, this is also the kind of dinner that pairs hilariously well with something like easy 2 ingredient slow cooker beer bread. I mean, bread plus sauce is never a bad idea.

“I tried this on a busy Monday and my family thought I grabbed takeout from our favorite place. The meat was so tender, and the sauce was the best part. Definitely making it again.”

Tips and Tricks for Cooking Flank Steak in the Slow Cooker

Flank steak is a lean cut, so it can go from amazing to kinda dry if you do not give it the right setup. The good news is that the slow cooker makes it easier, as long as you keep a few things in mind.

Use enough liquid. You do not need to drown the meat, but you want enough sauce so it braises and stays juicy. One cup of broth plus the sauces usually does it.

Cook it long enough. If it is tough, it usually just needs more time. On LOW, it will relax and get tender. If you cook on HIGH, keep a closer eye near the end.

Do not skip the rest time. Even in the slow cooker, resting helps the juices settle. I know it is hard to wait, but it matters.

Watch the salt. Soy sauce and Worcestershire can be salty depending on the brand. Taste the sauce at the end before adding extra salt.

Want extra flavor? Searing first helps, but I only do it when I have the energy. If I do not sear, I sometimes add a splash of balsamic or a pinch more smoked paprika.

One more random little tip: if you are meal prepping, slow cooker flank steak actually tastes even better the next day because the flavors settle in. It reminds me of how leftovers shine with saucy meals like slow cooked balsamic chuck roast.

Flank Steak Recipe Variations and Substitutions

This is where you can make the recipe feel like yours. I keep the base simple, then tweak depending on what we are craving or what is in the pantry.

Tex Mex style: Add 1 to 2 teaspoons chili powder, a teaspoon cumin, and a jar of salsa instead of broth. Serve with tortillas and lime.

Garlic butter style: Stir in a couple tablespoons of butter at the end, plus extra garlic and parsley. If you love that steakhouse vibe, you would probably also love this cowboy butter sauce steak dipping favorite for drizzling or dipping.

Sweet and smoky barbecue: Swap the soy sauce for barbecue sauce, and use broth just to thin it slightly. Add a tiny splash of apple cider vinegar to balance it.

Low sugar: Skip the brown sugar and use a little extra tomato paste, or a splash of orange juice if you want a natural sweetness without adding much.

No soy: Use coconut aminos instead of soy sauce. It keeps the savory vibe but is a little milder.

If you cannot find flank steak, skirt steak is the closest cousin. It can cook similarly, but it is thinner, so I check tenderness earlier. Chuck roast also works, but it will shred more like pot roast, which is still delicious.

How to Cut Flank Steak

This part is the difference between tender bites and that chewing forever feeling. Flank steak has long muscle fibers, and if you slice the wrong way, it will feel tougher even if it is cooked perfectly.

Here is my super simple method:

1) Put the cooked steak on a cutting board and look for the lines running across the meat. Those are the muscle fibers.

2) Slice against the grain, meaning you cut across those lines, not along them.

3) Use a sharp knife and make thin slices. If you want it extra tender, go thinner than you think.

4) If you are making sandwiches or tacos, you can also shred it with two forks, but I still like to slice first, then pull it apart a bit.

If you ever grill flank steak, you will notice the same rule applies. For a fun warm weather comparison, this grilled flank steak with cilantro parsley butter recipe is a good one to keep bookmarked for later.

How to Serve Slow Cooker Flank Steak

This is the part where you get to choose your own adventure. slow cooker flank steak is one of those recipes that can feel brand new just by changing the sides. I also love it because it works for a casual weeknight but still feels special enough for friends.

• Rice bowls: Serve over rice with the sauce, plus sliced avocado, chopped cilantro, and a squeeze of lime.
• Tacos: Warm tortillas, add steak, top with onion, jalapeno, and a quick slaw.
• Sandwiches: Pile it on toasted rolls with melty cheese and a little of the sauce for dipping.
• Mashed potatoes: Classic, cozy, and honestly my favorite when it is cold outside.
• Salad situation: Slice it thin and add it to a big crunchy salad for a lighter dinner.

If you have leftovers, try chopping the steak and stuffing it into quesadillas, or tossing it into a quick stir fry with frozen veggies. I have even tucked it into baked potatoes, which sounds odd but tastes amazing.

Common Questions

Can I put flank steak in the slow cooker frozen?

I do not recommend it. For safety and even cooking, thaw it in the fridge overnight first. If you forget, a cold water thaw in a sealed bag can help in a pinch.

Why is my slow cooker flank steak still tough?

It usually needs more time, especially on LOW. Also make sure you slice against the grain. Those two fixes solve it almost every time.

How do I know when it is done?

You are looking for tender. It should slice easily and pull apart without a fight. If you use a thermometer, aim for at least 190 F for that tender braised texture.

Can I make this ahead for guests?

Yes, and it is honestly a great idea. Cook it the day before, refrigerate, then warm it gently in the sauce. The flavor gets even better.

What is the best way to store leftovers?

Keep the steak in the sauce in an airtight container. It lasts about 3 to 4 days in the fridge, or you can freeze it for up to 2 months.

A cozy dinner you will come back to

If you have been wanting a no stress dinner that still feels satisfying, slow cooker flank steak is the one to try. You get tender beef, a savory sauce, and lots of ways to stretch it into different meals. I like that it is simple enough for a weeknight, but still tasty enough that people ask for it again. For more slow cooker inspiration, check out Easy Slow Cooker Flank Steak | Everyday Family Cooking and Slow Cooker Flank Steak – 15-Minute Prep – Ultra Tender Beef Dinner!, then come back and make this version your own. Let me know how you serve it, because I am always looking for a new leftover trick.