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1
Toast cumin seeds and peppercorns in dry pan 90 seconds; grind to powder.
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2
Combine sour orange juice, lime juice, garlic, ground cumin, ground pepper, salt, and oregano in bowl; whisk to emulsify.
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3
Coat pork slices thoroughly with marinade; rest 15 minutes at room temperature.
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4
Heat lard in cast-iron skillet or comal over medium-high until shimmering; remove pork from marinade, shaking off excess.
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5
Sear pork slices 3 minutes per side until caramelized and cooked through (63°C internal); transfer to serving plate.
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6
Pour reserved marinade into hot skillet; deglaze and reduce by half, 2 minutes; pour warm marinade over pork.
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7
Serve with pickled habanero chillies and white onion rings; accompany with warm corn tortillas.