grilled flank steak is one of those dinner saves that feels fancy, but honestly takes less effort than figuring out what to watch while you eat. If you have ever stood in front of the fridge wondering how to make steak feel exciting without a complicated sauce, this is for you. We are going bold and simple with a quick marinade, then finishing with a melt-on-top cilantro butter that tastes like something you would pay extra for at a restaurant. This is also a great option when friends pop by, because it cooks fast and slices up beautifully for sharing. And yes, you can totally pull this off even if you do not grill every week.
What Is Flank Steak and Why Is It Perfect for Grilling?
Flank steak is a long, flat cut that comes from the cow’s lower belly area. It is known for having a strong beefy flavor and a pretty obvious grain running through it. Because it is thinner than a lot of other steak cuts, it grills quickly, which is exactly what I want on busy nights.
Here is the key thing: flank steak is naturally a bit lean, so it loves high heat and smart slicing. If you treat it right, it turns into that juicy, tender bite that makes you feel like you nailed dinner.
Also, flank steak is super flexible. You can slice it for tacos, pile it on salads, or serve it straight up with potatoes. If you ever want a hands-off version for another day, I also love doing flank steak in the slow cooker, and this one is genuinely worth bookmarking: slow cooker flank steak.
What Is the Best Marinade for Flank Steak?
I like a marinade that hits the basics: salt, acid, fat, and something flavorful. You do not need a long ingredient list. For this Easy Grilled Flank Steak with Cilantro Butter, I keep it simple but punchy so the steak still tastes like steak.
Here is what I use most often:
- Olive oil for moisture and good browning
- Lime juice for brightness and a little tender help
- Soy sauce for salty depth
- Garlic because obviously
- Cumin or chili powder for that warm grilled vibe
- Black pepper and a pinch of brown sugar, optional
Mix it up, pour it over the steak in a bag or shallow dish, and flip it once or twice while it marinates. You are not trying to drown the meat, just coat it and give it a head start on flavor.
How to Make Cilantro Parsley Butter
This butter is the whole reason people ask for the recipe. It melts into the hot steak and turns into a little sauce without you actually making a sauce. I like to use cilantro plus parsley so it tastes fresh but not too intense for the cilantro skeptics at the table.
My go-to cilantro butter mix
Let a stick of butter soften on the counter so it is easy to stir. Then mix in:
Chopped cilantro, chopped parsley, minced garlic, lime zest, a pinch of salt, and a little black pepper. If you like a little heat, add a tiny pinch of red pepper flakes. I usually roll it into a log with plastic wrap and chill it, but you can also just spoon it into a small bowl and refrigerate until dinner.
When the steak comes off the grill, add a thick slice of the butter on top and let it sit for a couple minutes. That is the magic moment.
Little side note: if you love a rich, melty topping moment in general, you might also be into this sandwich situation for another day: brie blackberry jam grilled cheese. Totally different vibe, same comfort level.
Tips for the Juiciest Grilled Flank Steak
Flank steak can go from perfect to chewy if it is overcooked or sliced wrong. I have learned a few things the hard way, so you do not have to.
My practical tips:
Pat it dry before grilling if it is really wet from marinade. A little moisture is fine, but dripping wet meat steams instead of searing.
Get the grill hot before the steak goes on. Think confident sizzle, not sad simmer.
Do not press it down with a spatula. Let the grill do its job.
Rest the steak for at least 5 to 10 minutes after grilling. This helps the juices stay in the meat instead of spilling all over your cutting board.
I made this for my brother who is annoyingly picky about steak, and he went back for seconds before I even sat down. The cilantro butter is unreal.
How Long to Grill Flank Steak and at What Temperature?
Timing depends on thickness, but flank steak is usually pretty consistent. I grill it over medium high to high heat. If you are using a thermometer, you will feel like a genius, because it takes out the guesswork.
General guide for grilling flank steak:
Grill about 3 to 5 minutes per side for medium rare, and 5 to 7 minutes per side for medium, depending on thickness and grill heat. I like pulling it around 130 to 135 F for medium rare, because it will climb a few degrees while it rests.
And since this is a blog and I know we all love a shortcut, here is the truth: if you are unsure, start checking early. You can always cook it more. You cannot un-cook it.
How to Slice Flank Steak Against the Grain
This is not optional. This is the difference between tender bites and a jaw workout. Flank steak has long muscle fibers, and you want to cut across them so each piece is easier to chew.
Here is the easy way:
Look at the steak and find the lines running along it. Those lines are the grain. Turn your knife so you are cutting across those lines, not along them. Slice thinly, on a slight angle if you want it to look extra nice on the platter.
If your steak is really long, cut it into a few shorter sections first, then slice each section against the grain. It makes it less awkward and way more consistent.
Can You Marinate Flank Steak Overnight?
Yes, you can, and it is super convenient. For this Easy Grilled Flank Steak with Cilantro Butter, I like anywhere from 30 minutes to 8 hours. Overnight is fine, especially if you are planning ahead for a get together.
A quick tip though: if your marinade has a lot of acid like tons of lime or vinegar, it can start to change the texture if you leave it too long. Not always a disaster, but it can get a little mealy. My move is to keep the acid reasonable, or save a little extra lime to squeeze on right before serving.
What to Serve With Grilled Flank Steak
This steak plays nice with a lot of sides. I usually choose one fresh thing and one comforting thing, so the plate feels balanced without being fussy.
- Grilled corn or a simple corn salad
- Roasted potatoes or crispy smashed potatoes
- Green salad with limey dressing
- Warm tortillas for quick steak tacos
- Rice with a squeeze of lime and chopped herbs
If you are feeding a group with mixed cravings, I have absolutely done a fun comfort-food spread with steak plus crunchy sides. And if you ever want to lean all the way into that vibe another night, these are dangerously snackable: chicken fried steak fingers.
Also, I am going to be real with you, steak leftovers make an amazing next-day sandwich. If you want a cheesy inspiration that is totally weekend worthy, here is that link again because I come back to it a lot: brie blackberry jam grilled cheese.
Frequently Asked Questions About Grilled Flank Steak
Q: Should I grill flank steak with the lid open or closed?
A: Closed most of the time. It helps keep the heat steady like an oven. Open it just to flip and check temp.
Q: Why is my flank steak tough even if I did not overcook it?
A: Most likely slicing. Make sure you cut against the grain, thin slices, and give it a rest before cutting.
Q: Can I make Easy Grilled Flank Steak with Cilantro Butter without cilantro?
A: Yep. Use more parsley, plus a little extra lime zest. You can also add chives or green onion for freshness.
Q: What if I do not have a grill?
A: Use a grill pan or a hot cast iron skillet. You still want a good sear and a quick cook, then rest it.
Q: How do I store leftovers?
A: Wrap tightly and refrigerate up to 3 days. Reheat gently, or slice cold and use in salads or wraps.
More Easy Grilled Steak Recipes
If this Easy Grilled Flank Steak with Cilantro Butter hits the spot, you have options. You can swap the herbs in the butter, change the citrus, or do a spicy rub instead of a marinade. The main idea stays the same: hot grill, quick cook, rest, then slice right.
I also like looking at other approaches when I want to mix it up, and this is a solid reference if you want a slightly different direction: Grilled Flank Steak With Simple Garlic Marinade | The Modern Proper. It is a nice reminder that you do not need a million ingredients to make grilled flank steak taste amazing.
Alright, time to fire up the grill
Easy Grilled Flank Steak with Cilantro Butter is one of those recipes that makes dinner feel special without making you work all day. Keep the marinade simple, grill it hot and fast, rest it, then slice it the right way. Once that herby butter starts melting into the warm meat, you will see why I keep coming back to it. If you try it, make it your own and do not stress, because grilled flank steak is very forgiving when you follow the basics. And if you want another great flank steak angle, that Grilled Flank Steak With Simple Garlic Marinade | The Modern Proper guide is a fun one to compare and riff off next time.
Easy Grilled Flank Steak with Cilantro Butter
Ingredients
Method
- Mix all marinade ingredients in a bowl.
- Pour the marinade over the flank steak in a bag or shallow dish.
- Flip the steak once or twice while marinating for at least 30 minutes or up to 8 hours.
- Let a stick of butter soften.
- Mix in chopped cilantro, chopped parsley, minced garlic, lime zest, salt, and black pepper.
- Roll into a log with plastic wrap and chill until ready to use.
- Preheat grill to medium-high heat.
- Pat the steak dry before grilling, if necessary.
- Grill the steak for about 3-5 minutes per side for medium rare or 5-7 minutes for medium.
- Remove from grill and let rest for 5-10 minutes.
- Slice the steak against the grain for tender bites.
- Top the sliced steak with a thick slice of cilantro butter.
- Let it sit for a couple of minutes to melt, then serve.
