Low-Carb Flank Steak Tacos (Video)

Low-Carb Flank Steak Tacos can be made in the Instant Pot or the slow cooker, and these tacos are delicious with Spicy Mexican Slaw. 

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Watch the video to see if you might like to make
Instant Pot or Slow Cooker Low-Carb Flank Steak Tacos!


Low-Carb Flank Steak Tacos on plate text overlay photo

If you’re an Instant Pot fan, you probably noticed that I have a growing collection of pressure cooker/Instant Pot recipes on this site. But while I’ve been featuring recipes made in the pressure cooker or the Instant Pot I’ve also been hearing from people who still love their slow cookers, and want to make sure I don’t forget about the slow cooker! And what I’ve realized over and over is that so many of the recipes I loved in the slow cooker can also be adapted to the Instant Pot, and vice versa. So I’ve been updating the recipes where I feel there are two options for the cooking method, and one that I think you should definitely try in the Instant Pot or the Slow Cooker is these  Low-Carb Flank Steak Tacos. This recipe is such a keeper with the Spicy Mexican Slaw!

I adapted the beef part of the recipe from one in The Easy Pressure Cooker Cookbook that used flank steak. I haven’t cooked flank steak too much, and it’s not the cheapest cut of beef you could use for tacos, but I loved these flank steak tacos because the meat shredded apart just the right amount, and the flavor was great too. I made the recipe low-carb by using my favorite Mission Carb Balance Tortillas and making sure to choose a salsa without added sugar, but if you don’t care about low-carb just use any tortillas you prefer. And I was surprised at how the carbs added up when I calculated them for this recipe, but some of the higher-carb sauce will be left in the pressure cooker. For a version that’s lower in carbs, go easy on the slaw and use lettuce wraps for serving.

But please, please, please do try making Low-Carb Flank Steak Tacos if you have an Instant Pot (affiliate link) or a Cuisinart Electric Pressure Cooker (affiliate link) (or even a stovetop model.) You will love these tacos, I promise. And if you’re not a pressure cooker fan, see the recipe below for slow cooker instructions, or you can use my recipe for Slow Cooker Green Chile Shredded Beef Cabbage Bowl to make the beef if you prefer!

Pressure Cooker (or Slow Cooker) Low-Carb Flank Steak Tacos process shots collage

How to Make Pressure Cooker (or Slow Cooker) Low-Carb Flank Steak Tacos:

(Scroll down for complete recipe, including slow cooker instructions and nutritional information.)

  1. Cut up onion and measure the spices. 
  2. Turn the pressure cooker to saute (or medium-high heat on the stove), add the olive oil, and cook the onions for a few minutes, then add the spices and cook about a minute more.
  3. While onions cook trim the flank steaks and cut in half both lengthwise and crosswise.
  4. Add the flank steak, tomato salsa, and salsa verde to the pressure cooker.
  5. Set to MANUAL, HIGH PRESSURE, 45 minutes. Use natural release for 15 minutes, then quick-release to release the remaining pressure.
  6. Use a slotted spoon (affiliate link) to fish out the pieces of meat, leaving the sauce in the pressure cooker. (You can cook off some of the water if you think the sauce looks too thin.)
  7. Let meat cool for a few minutes on a cutting board, then shred it apart with two forks. Put meat back into the pressure cooker and stir to combine with the sauce.
  8. Make half the recipe of Spicy Mexican Slaw (or other slaw of your choice that would be good with spicy taco meat.)
  9. Heat a cast-iron frying pan and use it to warm one tortilla at a time; then fill the tortillas with some meat and slaw. (I like Mission Carb Balance Tortillas for this recipe.)
  10. Serve the tacos with extra lime and Green Tabasco Sauce (affiliate link) to add at the table if desired. I like them with a lot of lime!

Pressure Cooker Low-Carb Flank Steak Tacos with Spicy Mexican Slaw found on KalynsKitchen.com

Love Your Instant Pot?

I use a 6 Quart Instant Pot (affiliate link) for all my Instant Pot Recipes. Check out my growing collection of Pressure Cooker or Instant Pot RecipesClick here to see more Pressure Cooker / Slow Cooker Recipes on my other site!

More Low-Carb Recipes with Mexican Flavors:

Twenty-Five Healthy Low-Carb Mexican Food Dinners ~ Kalyn’s Kitchen
Slow Cooker Tex-Mex Pot Roast ~ The Perfect Pantry
Spaghetti Squash Low-Carb Taco Bowl ~ Kalyn’s Kitchen
Ten Amazing Low-Carb Mexican Food Dinners to Make in the Instant Pot ~ Slow Cooker or Pressure Cooker

Weekend Food Prep:

This recipe has been added to a new category called Weekend Food Prep  to help you find recipes you can prep or cook on the weekend and eat during the week!

Low-Carb Flank Steak Tacos

Low-Carb Flank Steak Tacos

Yield 8 tacos
Prep Time 15 minutes
Cook Time 1 hour
Total Time 1 hour 15 minutes

Flank steak gets spicy and tender in the slow cooker or Instant Pot, and then you make it into these Low-Carb Flank Steak Tacos with Spicy Mexican Slaw.


Flank Steak Ingredients:

  • 1 large onion, chopped
  • 2 T olive oil
  • 1 tsp. ground cumin
  • 1 tsp. chili powder (see notes)
  • 2 flank steaks, about one pound each
  • 1 1/2 cup salsa verde (see notes)
  • 3/4 cup tomato salsa (see notes)

Other Taco Ingredients:

  • 8 small taco-size flour tortillas (see notes)
  • Spicy Mexican Slaw (or other slaw of your choice)
  • extra limes for serving (optional)
  • Green Tabasco Sauce for serving (see notes, this is definitely optional)


Pressure Cooker / Instant Pot Instructions:

  1. Peel the onion and chop into smallish pieces. Measure the cumin and chili powder or Ancho chile powder. Heat the oil in the pressure cooker on saute setting, add the onions and cook 2-3 minutes or until they start to soften, then add the ground cumin and chili powder and cook about a minute more.
  2. While onions cook, trim visible fat from the flank steak and cut each steak lengthwise and then again crosswise. (I cut it so the shredded pieces of meat wouldn’t be too long to eat easily in a taco.)
  3. Add the flank steak pieces to the pressure cooker with the red and green salsa, lock the lid in place, set to MANUAL  HIGH PRESSURE (or bring to high pressure on the stove) and cook at high pressure for 45 minutes. You can use the quick release method to release the pressure, but if you have time I recommend doing 15 minutes natural release and then quick release.
  4. Use a slotted spoon to scoop out the meat, leaving the sauce in the pressure cooker. (Some brands of salsa have more water than others; if you think the sauce looks too thin you can turn the pressure cooker to Saute or Simmer – or medium low on the stove – and cook off some of the liquid.)
  5. Let the meat cool for a few minutes on the cutting board, then use two forks to shred the meat apart and put it back in the pressure cooker. Stir meat to combine with the sauce and keep warm.
  6. When the meat is almost done, make half the recipe of Spicy Mexican Slaw (or other slaw of your choice) to serve with the tacos.
  7. When you’re ready to eat, heat tortillas one at a time in a dry frying pan until the tortilla is hot and softened (cast iron pans are best for this.)
  8. Fill the tortilla with desired amount of saucy beef on one side and slaw on the other side and fold over to eat. Serve hot, with lime and Green Tabasco Sauce to add at the table if desired.
  9. Extra taco meat can be frozen or kept in the fridge for several days and reheated in a small pan or in the microwave. This meat can also be used for burritos, beef enchiladas, lettuce wraps, or taco salad.
Slow Cooker Instructions:
  1. Use ingredients as above, but reduce the amount of salsa verde to 1 cup and the amount of red salsa to 1/2 cup.
  2. Brown onions and spices in a frying pan on the stove and transfer to slow cooker. While onions brown, trim the meat as above.
  3. Add a little more oil to the frying pan and brown the pieces of meat on both sides. (Browning will add flavor for the slow cooker, highly recommend doing this.)
  4. Cook on low for 6-8 hours or on high for 3-4 hours, or until the meat shreds apart easily.
  5. Remove meat from the slow cooker as above and shred apart, then put back into slow cooker. (If there seems to be too much liquid in the slow cooker, you can put it in a pan on the stove and simmer to reduce, but generally the shredded meat will absorb the liquid when you add it back into the slow cooker.)
  6. Put meat back into the slow cooker on warm setting (or low) and prepare slaw and tacos as above.


I used ground Ancho chile powder, Herdez Salsa Verde (which didn’t have added sugar), Pace Picante Sauce (which didn’t have added sugar), and Mission Carb Balance Low-Carb Tortillas for this recipe. I serve the tacos with my favorite Spicy Mexican Slaw and Green Tabasco Sauce. (Links are affiliate links.)

Beef taco meat recipe was adapted from The Easy Pressure Cooker Cookbook.)

Nutrition Information:



Serving Size:


Amount Per Serving: Calories: 258Total Fat: 10gSaturated Fat: 2gUnsaturated Fat: 7gCholesterol: 18mgSodium: 703mgCarbohydrates: 13.5gFiber: 4gSugar: 5gProtein: 11g

Nutrition information is automatically calculated by the Recipe Plug-In I am using. I am not a nutritionist and cannot guarantee 100% accuracy, since many variables affect those calculations. Nutrition calculations for this recipe was done using net carbs for the low-carb tortillas.

If you make this recipe I'd love to hear how it turns out. Leave a star rating or share on social media with the hashtag #KALYNSKITCHEN, thanks!

Pressure Cooker (or Slow Cooker) Low-Carb Flank Steak Tacos thumbnail photo

Low-Carb Diet / Low-Glycemic Diet / South Beach Diet Suggestions:
Obviously you need to use low-carb tortillas like the ones I used if you’re making these tacos for any type of low-carb diet or the South Beach Diet Also check the tomato salsa and salsa verde and buy the brand with the least amount of sugar if you’re wanting this to be a carb-conscious meal. (Some salsa has a lot of added sugar.) These tacos are phase two or three for South Beach if made with tortillas, but for a Phase One, gluten-free, or Paleo option, this beef would be delicious inside lettuce wraps.

Find More Recipes Like This One:
Use Pressure Cooker Recipes to find more recipes like this one. Use the Recipes by Diet Type photo index pages to find more recipes suitable for a specific eating plan. You might also like to Follow Kalyn’s Kitchen on Pinterest to see all the good recipes I’m sharing there.

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