Last Updated on October 7, 2021 by Anne-Marie

You'll love grilling up this keto-friendly Grilled Soy-Lemon Flank Steak with Arugula recipe.

Why this recipe works

I find I'm always grilling even in the dead of winter. I just can’t wait until it’s warmer to treat myself to a tasty steak that’s marinated and grilled just right.

What I love about keto flank steak is that it’s also ideal for busy people who are budget minded.

That’s because flank is a fairly economical cut of beef that grills up in no time.

Plus, this grilled keto flank steak recipe is so easy to prepare with just a minimum of planning.

Making grilled flank steak is quick and easy

Get the beef marinating in the refrigerator before you head off for work in the morning. Then bring the flank steak up to room temperature when you get home.

I know the Soy-Lemon Flank Steak with Arugula recipe says only to marinate it for only six hours, but I don’t see how doing so for a few hours more would be too much of a big deal.

If you think the soy-lemon marinade would over flavor the meat, add 1/2 cup of water to the marinade to dilute it a bit.

You can put the steaks in the marinade for just an hour, too.

So if you’re in a rush and didn’t have time in the morning, when you get home from work, make up the marinate quickly and get the flank steak into a baggie or bowl.

Then change out of your work clothes and cook up your side dishes.

Make up a few cocktails and set the table. That should take up an hour, right?

How to tenderize your flank steak

Use a Jaccard Supertendermatic 48-Blade Tenderizer to prevent the flank steak from shrinking and curling up when it’s being grilled.

(That sometimes happens with cheaper and tougher cuts of meat.)

Many of my readers have bought the Supertendermatic and emailed to tell me that they love it!

You can use it on chicken breasts and when making carne asada, too.

Tips for making keto grilled flank steak

On keto? This is a low carb keto flank steak recipe as long as you use sugar free ingredients. (See below.)

Though I doubt there’s enough sugar in the marinade (2 tablespoons) to add that many carbs once you remove the meat.

Arugula, which is also known as rocket, has 2 grams of net carbs in one serving. One serving is 4 CUPS, so you don’t have to worry about that ingredient either.

If you love arugula, which is an excellent source of vitamins A and C, folic acid and calcium, maybe you should start adding it to your keto diet! I love its peppery taste and mix it in with my other salad greens.

Making a sugar free marinade: If you want to make a sugar-free keto flank steak marinade, substitute Swerve Sweetener, Brown for the light brown sugar.

I love Swerve Sweetener and use it in all my sugar free cooking and baking.

If you are on a gluten free diet, use tamari sauce instead of soy sauce. If you're on a low salt diet, look for a low sodium tamari.

More tips for making grilled flank steak

No fresh lemons? It’s OK to use bottled lemon juice if you forget to pick up fresh ones at the store. I won’t tell if you don’t.

Entertaining? Want to make Grilled Soy-Lemon Flank Steak with Arugula for a backyard barbecue party? Just triple the recipe and break out the paper plates!

Side dishes to make with flank steak

How about some tasty:

● Roasted Marinated Vegetables (gluten free)

● Easy Mexican Rice (gluten free)

● Gluten Free Tabbouleh Recipe (gluten free)

● Marinated Asparagus (keto and low carb friendly)

Originally published May 13, 2014 and May 19, 2016. Updated with new pictures and information.

Recipe and image used with permission by Martha Stewart Living, May 2014 issue.

Photography by Ryan Liebe.