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Cut stems off the chilies, remove seed pods and sees.
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In a dry pan set over medium heat, gently toast the chilies until warmed through, soft and fragrant.
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Chop roasted chilies into smaller pieces and add to a food processor along with one Chipotle pepper, one teaspoon of adobo sauce and all other marinade ingredients except cilantro and garlic.
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Blend marinade ingredients until completely smooth.
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Coarsely chop cilantro, stems and all, and add to marinade along with finely minced garlic. Allow to rest for a few minutes.
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Place meat in a large Ziploc bag and carefully pour in the marinade. Shake and knead bag to evenly distribute the marinade across the surface of the meat, forcing as much excess air as possible out in the process.
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Seal bag and leave to marinade in the fridge for at least 3 but no more than 12 hours.
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Remove meat from fridge at least half an hour prior to cooking.
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Fire up your favorite grill, grill pan or cast iron skillet.
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Remove any excess marinade, cilantro sprigs or large pieces of garlic from surface of the meat to avoid excess charring and burnt flavors.
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Cook meat over high heat for about 2-5 minutes per side depending on thickness until well and thoroughly browned.
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Remove meat from heat and let rest loosely covered for an additional 5-10 minutes.
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At this point, the meat should have an internal temperature of about 52-55C (rare to medium rare) and yield easily to the touch of a finger yet spring back quickly when released.
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Once well rested, slice beef thinly across the grain, pour over any accumulated juices and serve.