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Tex-Mex chicken fajita taco with sliced chicken and caramelized onions on a comal
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Real Tex-Mex Chicken Fajitas

Chicken fajitas recipe using a two-stage brine and pineapple soy marinade for maximum flavor and juiciness, served with restaurant-style caramelized onions and a foamy mantequilla de ajo garlic butter sauce. Adapted from Pappasito's in Houston and Ford Fry's Tex-Mex cookbook.
Course Main Course
Cuisine Tex-Mex
Keyword chicken fajita marinade, chicken fajita recipe, chicken fajitas, fajita garlic butter, fajita onions, mantequilla de ajo, pineapple soy marinade, tex mex chicken fajitas, tex mex recipe
Prep Time 30 minutes
Cook Time 50 minutes
Brining and Marinating 7 hours
Total Time 1 hour 20 minutes
Servings 6 servings
Calories 545kcal
Author Jason Farmer

Equipment

Ingredients

Chicken

  • 2 lbs boneless, skinless chicken breast Tenderloin removed, thick part pounded to ¾-1 inch

Chicken Fajita Brine

  • 2 liters water
  • ½ cup kosher salt 67g by weight. For Morton's Kosher use 4 tablespoon + 2 tsp. For Morton's table salt use 3 tablespoon + 2¼ tsp. Or weigh 67g of any salt.
  • ¼ cup sugar
  • ½ teaspoon cumin
  • 2 bay leaves
  • 10 garlic cloves
  • 2 teaspoon Mexican oregano Regular oregano works as a substitute
  • 2 teaspoon black peppercorns

Pineapple Soy Marinade

Fajita Seasoning Spice

Basic Buttered Fajita Onions

Caramelized Fajita Onions

Mantequilla de Ajo (Garlic Butter Sauce)

  • 2 sticks unsalted butter Must be softened to room temperature.
  • 1 ¼ teaspoon Knorr Caldo de Pollo chicken bouillon Or ½ Knorr chicken bouillon cube, crushed (6g)
  • 2 teaspoon fresh garlic Grated. Or substitute ½ teaspoon granulated garlic.
  • ¼ cup white wine Preferably Chardonnay

For Cooking

Instructions

Prepare the Chicken

  • Remove the tenderloin from the bottom of each chicken breast and set aside.
  • Flip the breast over and cut crossways roughly halfway through, separating the thinner side from the thicker side.
  • Butterfly or pound the thicker piece until it's about ¾ inch to 1 inch in thickness for even cooking.

Make the Brine

  • Add all brine ingredients to a medium pot and bring to a boil.
  • Stir until the salt and sugar are dissolved and boil for 1 minute.
  • Remove from heat and let the brine cool to room temperature before using.

Brine the Chicken

  • Place the chicken pieces in the cooled brine and refrigerate for 3-4 hours.
  • Remove the chicken from the brine and wash under cold running water to remove any herbs and spices.

Marinade the Chicken

  • Mix pineapple juice, soy sauce, and water until well combined.
  • Place the brined chicken in the marinade and refrigerate for 4-8 hours.

Basic Buttered Fajita Onions

  • Slice onions with the grain into ½-inch pieces.
  • Melt butter in a large pot over medium to medium-high heat.
  • Add onions, salt, pepper, and chicken bouillon. Stir until butter and spices evenly coat the onions.
  • Cook for several minutes until the edges of the onions are lightly browned.
  • Remove from heat and use immediately or reserve. Can be made several days ahead.

Caramelized Fajita Onions

  • Whisk together sherry cooking wine, soy sauce, granulated garlic, cumin, black pepper, sugar, salt, and chicken bouillon in a small bowl and set aside.
  • Slice onions with the grain into ¼-inch pieces.
  • Melt butter in a large pan over medium heat. Add onions and sweat for several minutes until translucent.
  • Add the sauce mixture and stir into the onions.
  • Cook until all the sauce mixture has evaporated and the onions are sticking to the bottom with a deep brown color, about 5-15 minutes.
  • Remove from heat and use immediately or reserve. Can be made several days ahead.

Mantequilla de Ajo (Garlic Butter Sauce)

  • Let butter sit at room temperature for several hours until completely softened.
  • Add chicken bouillon, garlic, and wine to the bowl with the butter.
  • Beat with a hand mixer until the wine is completely incorporated and you see very little liquid remaining.
  • Refrigerate in ramekins. To serve, microwave in 15-30 second bursts until the butter is melted and foamy.

Cook the Fajitas

  • Preheat oven to 350°F (176°C).
  • Remove the chicken from the marinade and pat dry thoroughly with paper towels.
  • Mix together all fajita seasoning spice ingredients.
  • Heat neutral oil in a large pan over medium-high heat. When the oil is hot, sprinkle the chicken pieces with the fajita seasoning spice.
  • Cook the chicken until well browned on both sides.
  • Transfer the pan to the oven and cook until the chicken reaches an internal temperature of 160°F (71°C). Carryover will bring it to 165°F (74°C).
  • Remove chicken from oven and let rest for 5-10 minutes before slicing.
  • Slice the chicken across the grain into roughly ½-inch pieces.
  • Serve with fajita onions and foamy garlic butter. For the restaurant sizzle effect, heat a comal, layer onions and chicken on top, and splash the edges with water, broth, or lime juice right before serving.

Video

Notes

Salt Conversions for Brine: ½ cup Diamond Brand Kosher Salt = 67g. For Morton's Kosher Salt use 4 tablespoon + 2 teaspoon (67g). For Morton's Table Salt use 3 tablespoon + 2¼ teaspoon (67g). Or weigh 67 grams of any salt.
Garlic Butter Microwave Shortcut: If you don't have a hand mixer, melt 1 stick of butter in the microwave (covered with plastic wrap). Whisk in ¾ teaspoon chicken bouillon, 1 teaspoon grated garlic, and 2 tablespoon white wine. The flavor is better with the hand-mixer method.
Big Batch Garlic Butter: Double the recipe (4 sticks butter, 2½ teaspoon bouillon, 1 tablespoon garlic, ½ cup wine). Portion and freeze for up to 3-6 months.
Pineapple Juice: Use canned, pasteurized pineapple juice (Dole recommended). Fresh pineapple juice contains too much bromelain and can turn the chicken mushy.
Onions: Both types of fajita onions can be made several days ahead. Reheat before serving.

Nutrition

Calories: 545kcal