1. Season beef with 1 teaspoon salt. Heat oil in a 5- to 6-quart heavy pot over medium-high heat and brown the meat in batches, without crowding, turning occasionally, 6 to 8 minutes for each batch. Transfer meat to a bowl.
2. Sauté onion in the same pot, adding extra tablespoon oil if needed, over medium heat until softened, about 3 minutes. Add adobo marinade and cook, stirring for 5 minutes to slightly thicken. Stir in tomato sauce, beer, water and pickled jalapenos and their juice. Bring to a boil. Return beef to the pot, cover and simmer until beef is tender, 1½ to 2 hours.
3. Stir in the chocolate until melted. Taste and add salt as needed. If the sauce seems too thin, simmer uncovered as needed to make it thick enough to coat the meat.
4. Make tacos with the tortillas, meat, onion and cilantro.
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