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1
Remove stems and seeds from the dried red chile pods. Cover with hot water and soak until the flesh is fully supple and the skins yield without resistance when pressed.
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2
Transfer the rehydrated chiles to a blender with the raw garlic, cumin, and Mexican oregano. Add enough of the soaking liquid to allow the blades to run freely. Blend to a smooth purée. Pass through a sieve if the skins have not broken down completely — the purée should be uniformly smooth with no visible flecks of skin.
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3
Heat the lard or neutral oil in a heavy pan over medium heat. Add the chile purée all at once — it will spatter. This is the step on which the dish lives or dies: fry the purée, stirring constantly, for 5 minutes. The fat cooking concentrates the sauce, deepens its colour slightly, and drives off the raw chile note entirely. The sauce is ready when its colour has shifted to a deeper brick-red and it no longer smells raw.
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4
Remove from heat. Season with salt. The finished sauce should coat a wooden spoon — thicker than a broth, thinner than a paste. Adjust consistency with soaking liquid if required.