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1
To make the marinade: Combine the lime juice, garlic, salt, beer and meat in a large zip-top bag. Close the bag and shake it to coat the meat. Marinate at least 4 hours or overnight.
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2
To make the rajas: Char the chiles directly over a gas or electric burner, under a broiler, or on a very hot outdoor grill. Place in a plastic bag for 5 minutes and gently remove the skins, seeds and stems. Slice the chiles into 1/4-inch strips.
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3
In a medium saute pan over medium-high heat, saute the onion in the oil and butter until golden brown, about 5 minutes. Stir in the garlic and chile strips.
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4
Saute for 5 minutes.
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5
Remove the steak from the marinade, and dry with paper towels. Brush both sides of the steaks with the oil.
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6
Preheat the oven to 350u00b0. Preheat a gas grill or indoor grill to high.
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7
Place the steak on the hottest part of the grill. Grill the steak turning once, for about 4 to 6 minutes per side for medium-rare, longer if desired.
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8
Let the steak rest for 10 minutes, then cut into thin strips across the grain, then into 3 to 4-inch pieces.
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9
Arrange the tortillas into two stacks of six. Wrap each stack in foil, and heat them in the oven for 5 to 10 minutes or until heated through and pliable. If the tortillas are dry, wrap them in a slightly damp paper towel before wrapping in foil.
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10
To serve, place a few slices of meat into each warm tortilla, top with rajas, pico de gallo and guacamole.
