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keto low carb steak fajitas on a lettuce wrap

Easy, Keto Low-Carb Steak Fajitas with Marinade

Easy, Keto Low-Carb 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.
Course dinner, lunch
Cuisine American, Mexican
Keyword keto fajitas, low carb fajitas, steak fajitas, steak lettuce wraps
Prep Time 20 minutes
Cook Time 15 minutes
marinate 2 hours
Total Time 2 hours 35 minutes
Servings 8
Calories 202kcal


  • 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


  • 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!


Serving: 1wrap | Calories: 202kcal | Carbohydrates: 4g | Protein: 20g | Fat: 11g