Leftover steak taco filling in a cast iron pan.
5 from 1 vote

Leftover Steak Tacos

Learn how to make steak tacos from leftover meat (and sneak in some veggies!)! As a bonus, you also get my DIY taco spice mix recipe!
Course Main Course
Cuisine Mexican
Keyword beef taco filling recipe, leftover steak tacos, steak tacos
Prep Time 15 minutes
Cook Time 15 minutes
Total Time 30 minutes
Servings 6 people
Calories 282kcal
Author Longbourn Farm • Alli Kelley


  • 3 cups steak (cooked, leftover) chopped
  • 1 tablespoon vegetable oil
  • 1 medium onion diced
  • 2 garlic cloves minced
  • 1 cup zucchini diced or shredded
  • 2 tablespoons chili powder
  • 1 teaspoon cumin
  • 1 teaspoon coriander
  • 1 teaspoon dried oregano
  • 1/2 teaspoon garlic powder
  • 1/2 teaspoon onion powder
  • 1 pinch cayenne pepper
  • 1 tablespoon tomato paste
  • 1/2 cup beef broth water can be substituted
  • salt and pepper to taste


  • Add oil to the pan and let it heat until shimmering.
  • Cook onion and zucchini until just beginning to brown, about 3 minutes.
  • Add the cooked steak and stir until combined and heated through about 3 minutes. 
  • Add garlic and cook until fragrant, about 30 seconds.
  • Add the spices, stir to coat meat and vegetables. Cook for about 1 minute.
  • Add tomato paste and beef broth stir to combine and simmer until reduced and very little liquid remains about 3 minutes.
  • Fill taco shells of your choice, or fry up your own tacos!


You can use whatever leftover cooked meat you have. Steak, roast, anything you have. Whatever you use, I recommend keeping the filling pieces chopped pretty small so they fit well in the tortilla shells and everything in the filling is a uniform size.
I always try to include a veggie in the beef mix, and this time of year it's zucchini. Any other mild flavored vegetable will go great in beef tacos, the beef and the seasonings have bold flavors so slipping some mild flavored veggies in there shouldn't bother anyone.
I actually make a large batch of the spices in this recipe so I can have homemade taco spice mix on hand. I add about 3 tablespoons of the taco spice mix per pound of meat, but taste test to your preference. Here is the spice mix recipe for a larger batch:  Homemade Taco Seasoning


Calories: 282kcal | Carbohydrates: 5g | Protein: 24g | Fat: 18g | Saturated Fat: 9g | Cholesterol: 68mg | Sodium: 201mg | Potassium: 479mg | Fiber: 1g | Sugar: 1g | Vitamin A: 890IU | Vitamin C: 5.9mg | Calcium: 34mg | Iron: 3mg