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1
Grind garlic with kosher salt with a mortar and pestle until a paste forms. Whisk garlic paste, lime juice, olive oil, cilantro, chili powder, sugar, paprika, and cayenne pepper together in a bowl; pour marinade into a resealable plastic bag. Add skirt steak strips, coat with the marinade, squeeze out excess air, and seal the bag. Marinate in the refrigerator, 2 hours to overnight.
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2
Remove steak from marinade and shake off excess; discard remaining marinade.
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3
Preheat oven to 300 degrees F (150 degrees C). Wrap tortillas tightly in aluminum foil to form a packet and place packet on a baking sheet.
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4
Bake in the preheated oven until warmed through, about 10 minutes. Keep warm.
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5
Heat 1 teaspoon canola oil in a large skillet over high heat until oil begins to smoke. Saute onion and bell pepper in hot oil until browned and almost tender, 4 to 5 minutes. Transfer onion and pepper to a plate.
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6
Heat 1 teaspoon canola oil in the same skillet over high heat until oil starts to smoke. Cook 1/2 of the steak in hot oil until browned on all sides but still pink in the center, 4 to 6 minutes. Transfer cooked steak to the plate with onion and pepper.
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7
Heat remaining canola oil in the same skillet. Cook remaining steak in hot oil until browned on all sides but still pink in the center, 4 to 6 minutes. Stir cooked steak, onion, bell pepper, and any accumulated juices back into the skillet. Add minced garlic and salt; cook and stir until fragrant and heated through. Remove from heat. Divide steak mixture between warm tortillas.
