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Tri-Tip Fajitas

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Our Tri-tip Fajitas are always a good idea, and this one uses our slow cooker tri-tip recipe for the ultimate level of ease! We add a quick and easy marinade that boosts the flavor of the sautéed onions, bell peppers and shredded beef, then stuff it all into a warm flour tortilla. Dinner perfection? YES x 100!

Fajita and fork on a plate with cilantro sprig beer and condiments in background

These tri-tip fajitas are:

  • simple to make
  • a no-fuss dinner recipe that makes wonderful lunch leftovers
  • the best combination of tender beef tri-tip with al dente onions and peppers
  • a family favorite!

What is tri-tip?

Tri-tip is a specific cut of the beef that is flavor-packed, yet lean and low in fat. Because tri-tip is low in fat (and we all know fat = flavor!), a marinade or rub is typically used with this cut of meat to enhance its flavor.

One of the things we love about a tri-tip roast is it’s an incredibly affordable cut of meat that will easily feed a family! For more on tri-tip and to check out some other amazing tri-tip recipes, try these out:

The best thing about this recipe is you can make slow-cooker tri-tip specifically for these tri-tip fajitas, or you can use any leftover tri-tip to make this quick and easy dinner!

The trick to amazing tri-tip fajitas

This process all begins with a simple marinade that works in two ways: it adds a flavor boost (thanks to our delicious fajita seasoning), and also adds a bit of moisture into the shredded meat.

Shredded beef in skillet with fork, jar of marinade in background

how do you tenderize fajita meat?

Have you ever had dry fajita meat? The trick to getting ultra tender fajita meat is all in the marinade! The combination of oil, spices, sugar and a little acid from the lime works together to infuse the tri-tip with yummy flavor and helps to break down and tenderize the meat.

First things first, let’s begin with our favorite seasoning blend!

Our go-to fajita seasoning

Our marinade uses a delicious combination of spices that you probably already have in your pantry! Here are the ingredients you need to make our go-to fajita seasoning, which is then mixed with oil, lime juice and fresh herbs to make the marinade.

  • ground cumin
  • salt
  • pepper
  • brown sugar

In a jar, place the fajita seasoning spices along with freshly-squeezed lime juice, vegetable oil, garlic, chopped cilantro and a seeded and minced jalapeño. Put the lid on the jar and shake to combine.

Fajita marinade, spices, garlic, lime, peppers and oil in background

how to make tri-tip fajitas

Now that the marinade is done, you’ll need just a few other ingredients to prep and assemble the most incredible tri-tip fajitas!

  • shredded tri-tip roast (from our slow cooker tri-tip recipe)
  • vegetable oil
  • yellow onion, sliced
  • red onion, sliced
  • bell peppers (one of each color: red, yellow, and green)
  • 10-inch flour tortillas
  • lime wedges, salsa and sour cream
Skillet with fajita vegetables and a spatula

To make the fajita filling

This all comes together rather quickly, and it’s a super simple process:

  1. Cook the meat in the marinade. Cook the shredded tri-tip in a skillet with the marinade to moisten the meat. Toss to combine and reheat the meat for about 5 minutes. Remove from the heat and cover the skillet to keep the meat warm while you prep the rest.
  2. Sauté the onions and bell peppers. Heat the oil in a large skillet over medium-high heat, then add the onions and bell peppers along with 3 tablespoons of the reserved marinade. Cook until the onions and peppers are al dente- lightly cooked but still crisp. Remove from heat.
  3. Assemble the tri-tip fajitas. Place the tortillas in between dry paper towels, alternating them. Cover them with a damp paper towel and microwave on high for 1 minute to soften. Add the fajita vegetables and shredded beef to each tortilla and serve with lime wedges, salsa, and sour cream.

For more fajita recipes, check these out:

two beef fajitas in stand-up rack

Enjoy these delicious, flavor-packed tri-tip fajitas! The moist and tender shreds of tri-tip with the crisp, sautéed onions and peppers are the perfect filling inside these soft and pillowy flour tortillas.

It’s a dinner dream, even more so because it all comes together with ease! We can’t wait for you to try them.

More Recipes You Will Love

  • Sheet Pan Chicken Fajita Bowl: This easy Sheet Pan Chicken Fajita Bowl is a twist on Tex-Mex fajitas.  Zesty marinated chicken strips, red and green bell peppers and thick-cut onion rings roasted on a sheet pan.  Served in a bowl with salad greens and a simple dressing rather than wrapped in a tortilla.
  • Tex-Mex Fish Tacos with Chipotle Slaw: Tex-Mex fish tacos with chipotle slaw in a warm tortilla. Crispy, flaky fish and a crunchy slaw with chopped cabbage, carrot, onion, jalepeno peppers and cilantro mixed with a spicy chipotle dressing that enhances all the flavors.
  • Kamut Flour Tortillas: Kamut flour tortillas are thin, soft and easy to make with just a few simple ingredients. They are always a delicious accompaniment to your favorite Southwestern meal! Just butter a hot tortilla, roll it up and enjoy.

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Tri-Tip Fajita and fork on a plate with cilantro sprig beer and condiments in background

Tri-Tip Fajitas

Easy beef tri-tip fajitas made from leftover tri-tip roast. A quick, flavorful marinade moistens the sautéed onions, bell peppers and shredded beef then stuffed into warm flour tortillas.
5 from 3 votes
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Prep Time: 10 minutes
Cook Time: 10 minutes
Total Time: 20 minutes
Servings: 4 Servings
Calories: 529kcal
Author: Pat Nyswonger



  • ¼ cup vegetable oil
  • ½ cup freshly squeezed lime juice
  • 2-3 garlic cloves grated or minced
  • ½ red jalepeno pepper seeded and minced
  • 3 tablespoons chopped fresh cilantro
  • 1 teaspoon ground cumin powder
  • ½ teaspoon salt
  • ¼ teaspoon black pepper
  • 1 teaspoon brown sugar

For the Fajita Filling:

  • 8 ounces shredded slow cooker tri-tip roast *see notes
  • 2 tablespoons vegetable oil
  • 1 medium yellow onion sliced
  • ½ medium red onion sliced
  • 3 large bell peppers red, yellow and green
  • 4 10- inch flour tortillas
  • Lime wedges salsa and sour cream


For the Marinade:

  • Add all the marinade ingredients to a jar, put the lid on and shake to combine.  Set aside.

For the Fajita Filling:

  • Add the shredded tri-tip to a skillet set over medium-low heat.  Drizzle 1/2 to 3/4 cup of the marinade over the beef to moisten, toss to combine and reheat, about 5 minutes.  Remove from the heat, cover the skillet and keep warm while preparing the fajitas.
  • Heat the oil in a large skillet set over medium-high; then add the onions and bell peppers.  Sprinkle with 3 tablespoons of the reserved marinade and cook until the onions and peppers are lightly cooked (al dente) and slightly crisp.  Remove from the heat.

To Assemble:

  • Alternate tortillas with dry paper towels on a plate and cover with a damp paper towel.  Microwave on high for 1 minute.
  • Add fajita vegetables and shredded beef to each tortilla and serve with lime wedges, salsa and sour cream.


Use leftover tri tip from one of the following recipes:


Serving: 1 | Calories: 529kcal | Carbohydrates: 43g | Protein: 21g | Fat: 31g | Saturated Fat: 3g | Polyunsaturated Fat: 21g | Trans Fat: 1g | Cholesterol: 49mg | Sodium: 599mg | Fiber: 4g | Sugar: 6g

Pat Nyswonger

Pat is a wife, mom of four adult children, and grandmother to seventeen beautiful children. She is a self-taught home cook and loves creating delicious meals for her family and friends. Her kitchen is the hub of activity in her home, and she loves to entertain.

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Saturday 3rd of October 2020

I never used brown sugar for marinating meat. How does it help Dahn, does it caramelize the meat.The shredded meat looks full of flavors and fajitas look amazing !!

Pat Nyswonger

Saturday 3rd of October 2020

Hi, Rahul....The brown sugar does do some caramelizing but also balances out the flavors of the marinade. These fajitas are so good and having a few packages of pre-cooked shredded beef in the freezer make this an easy, easy dinner! Thanks for your comments and questions. :)

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