Fry the meat until golden on both sides.
In the same oil, lightly fry the the sliced onion, the garlic and the ancho chili. Put the meat back in the pot and add the liquid in which it marinated.
Retop the pot and cook on low flame for 45 minutes, stirring occasionally. Remove from heat the meat is tender.
Serve on a plate with slices of onion. Liquify the sauce in which it cooked and serve with the meat.
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