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1
In a medium bowl, combine the cilantro, garlic, shallot, serrano pepper, cumin, lime juice, 1/4 cup of the olive oil and tequila. Whisk to combine and place in a 1-gallon re-sealable food storage bag with the flank steak. Allow to marinate at room temperature for 45 minutes.
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2
Preheat a grill or grill pan to medium-high heat and brush the grates with an oil soaked rag. Remove the steak from the marinade and scrape off any excess marinade. Season the steak on both sides with 1 1/2 teaspoons of the kosher salt and the black pepper. Place on the grill and cook for 4-15 mins on each side (depending on how done you would like it). Remove from the grill and allow to rest for 5 minutes on a cutting board before slicing against the grain.
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3
Set a 12-inch saute pan over medium-high heat and add the remaining 2 tablespoons olive oil. Once the oil is hot, add the green, red and yellow bell peppers as well as the remaining 1/4 teaspoon of the kosher salt to the pan and saute, stirring often until the peppers are softened and well caramelized, about 4 to 5 minutes.
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4
Toast the tortillas in a hot dry pan, or directly over an open flame until lightly toasted and warmed through. Serve the tortillas with the steak, peppers, Guacamole and Chipotle Mayonnaise.
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5
For the guacamole:
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6
Combine all ingredients in a small bowl and stir until thoroughly combined. Cover tightly with plastic wrap and set aside, refrigerated, until needed. Should be made as close to serving time as possible.
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7
For the Chipotle Mayo:
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8
Combine all ingredients in the bowl of a food processor and process until smooth, about 1 to 2 minutes. Transfer to a small bowl and refrigerate until needed.