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In a medium bowl mix together the lime juice, oil, garlic, Worcestershire sauce, brown sugar, jalapeño cilantro, salt and pepper. Reserve ⅓ cup of the marinade and set aside. Place chicken in the marinade, cover and let sit in the refrigerator 15-30 minutes.
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Brush the peppers and onion slices with oil and season with salt and pepper.
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Place vegetables and marinated chicken on grill, turning the chicken 45 degrees after about 3 minutes to create grill marks.
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Continue to cook peppers and onions, flipping them until they are charred and the onions are translucent.
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Flip chicken breast and continue cooking until they reach 160 degrees or are no longer pink inside. Transfer to a platter and allow chicken to rest, so juices redistribute.
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Separate the onions into rings and slice the peppers and chicken into strips.
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Drizzle remaining marinade over the chicken and vegetables and toss to coat.
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Serve the chicken and vegetables with the flour tortillas and your choice of toppings.