Easy, Keto Low-Carb Paleo Steak Fajitas with Marinade is a quick healthy recipe that uses flank, sirloin, or skirt steak to grill juicy carne asada beef fajitas. This recipe includes instructions to prepare homemade seasoning and a marinade that will make your mouth water. Serve the steak and veggies on lettuce wraps or as a bowl.
This post may contain affiliate links. Please read my full disclosure here.
This post was originally posted in 2017. It has since been updated.
FOR THE FULL LIST OF INGREDIENTS AND COMPREHENSIVE INSTRUCTIONS, PLEASE SEE THE RECIPE CARD AT THE END OF THIS POST. BEFORE YOU SCROLL, THERE’S IMPORTANT INFORMATION IN THIS BLOG POST.
It’s not a secret among my friends and family that my steak marinade is the absolute truth. I love to whip up juicy, mouth-watering steaks. My preferred method is grilled. I find it easier to obtain medium doneness that way.
The grill also offers so much flavor. I grill pretty much any time of the year. I’m not afraid to put on my coat and snow boots during the winter for the sake of a great meal. If you don’t have a grill, stove top or the oven will work just fine.
How to Make Fajitas on Keto Diet
Nice low-carb fajitas are very easy to make. You will need fresh chopped onions and peppers along with steak, preferably skirt or sirloin. Then you will make homemade fajita seasoning using chili powder, unsweetened cocoa powder, cumin, steak seasoning, garlic powder, salt, and pepper. All of these ingredients are naturally low in carbs and perfect for the keto diet and lifestyle.
How to Make Steak Fajitas Marinade
I use low-sodium soy sauce as the liquid base for the marinade. Combine it with the steak and chili powder, unsweetened cocoa powder, cumin, steak seasoning, garlic powder, salt, and pepper. Marinate the meat in the fridge, preferably overnight for at least 2 hours.
How to Make Good Steak Lettuce Wraps
- I prefer to grill the marinated steak, carne asada style. Once the steak has finished marinating, place a grill on medium-high heat. Allow the grill to heat for 4-5 minutes.
- Add the steak and grill until preferred doneness. Use a meat thermometer and test the interior of the meat to determine when it has finished cooking. The USDA minimum is 145 degrees. Here is a listing of the barometer: rare: 120-130 degrees, medium rare: 130-135 degrees, medium, 135-145 degrees, medium well 145-155 degrees, and well done 155 degrees.
- Season the veggies with garlic powder and place the vegetables in a grill basket and grill for 7-10 minutes until the veggies are soft and slightly charred.
- Remove the steak and veggies from the grill. Allow the meat to rest for 10-15 minutes prior to serving.
- Serve the fajitas over crunchy lettuce wraps. Romaine and butter lettuce work the best.
You can read more about the science and temperatures of cooking here.
How Many Carbs are in Keto Steak Fajitas?
These steak fajitas have 4 net carbs.
Do I Have to Grill the Steak?
No, you can also pan sear the steak using the same temperature direction noted above.
You may love our Steak Stir Fry recipe.
Easy, Keto Low-Carb Steak Fajitas with Marinade
Ingredients
- 1 pound sirloin steak tips, skirt, or flank steak
- 1/2 cup sliced red onion
- 1/4 medium green pepper sliced into thin pieces
- 1/4 medium red pepper sliced into thin pieces
- 1/4 medium orange pepper sliced into thin pieces
- 1/4 medium yellow pepper sliced into thin pieces
- 1 tablespoon grassfed butter
- Romaine lettuce slices for wraps
Steak Marinade
- 1 1/2 tablespoons of low sodium soy sauce or liquid aminos
- 1 teaspoon dry, unsweetened Cocoa powder
- 2 teaspoons McCormick’s Grill Mates Montreal Steak Seasoning
- 2 teaspoons McCormick’s Grill Mates BBQ Seasoning
- 1 teaspoon chili powder
- 1 teaspoon cumin
- 1 teaspoon garlic powder
- salt and pepper to taste
Instructions
- I like to use sirloin tips because they are sliced perfectly for fajitas. You can use whole steaks if you wish and you can slice it before or after cooking.
- Drizzle the soy sauce over the steak.
- Combine the seasonings in a bowl.
- Sprinkle the seasonings on both sides of the steak. Place the steak in a Ziploc bag. Seal the bag, removing all air. Pat the outside of the bag to ensure added soy sauce saturates the meat.
- Place in fridge to marinate for at least 2 hours, preferably overnight.
- Once the steak has finished marinating, place a grill on medium-high heat. Allow the grill to heat for 4-5 minutes.
- Add the steak and grill until preferred doneness. Use a meat thermometer and test the interior of the meat to determine when it has finished cooking. The USDA minimum is 145 degrees. Here is a listing of the barometer: rare: 120-130 degrees, medium rare: 130-135 degrees, medium, 135-145 degrees, medium well 145-155 degrees, and well done 155 degrees.
- Season the veggies with garlic powder and place the vegetables in a grill basket and grill for 7-10 minutes until the veggies are soft and slightly charred.
- Melt 1 tablespoon of grass-fed butter in the microwave for 30 seconds and stir. After the steak has reached the desired doneness, using a cooking brush, brush the butter onto both sides of the steak while it’s on the grill.
- Remove the steak from the grill and allow it to cool for 10-15 minutes before serving.
- Spoon the mixture into the center of a lettuce leaf. Serve!
Sydney
Sunday 27th of August 2023
My go to fajita recipe and marinade! The best!
Sydney
Tuesday 28th of March 2023
This marinade is everything! First time making steak fajitas and I will definitely be going back to this recipe for the future. So tasty.
Sara Porter
Monday 29th of March 2021
Hey there! Ibfound thisbrecipe a couple years ago and absolutely loved it. I was soooo happy to find it again today, but I noticed the vegetables are cooked differently. Do you happen to have have the old recipe? I remember that the vegetables were cooked with fresh garlic and siracha on the stove, but that's it.
staysnatched
Saturday 3rd of April 2021
I don't, but that's how I remember it. The way you described it.
p3orion
Tuesday 23rd of April 2019
TLDR version: Make fajitas. Use lettuce instead of tortillas.
Simi
Thursday 20th of September 2018
Could you recommend some sort of seasoning for ground turkey? I’d like to make these today, but only have ground turkey.
staysnatched
Thursday 20th of September 2018
Hi there. McCormick's Grill Mates also makes a Montreal Chicken Seasoning that works well for ground turkey.