Instructions: Marinade: Combine marinade ingredients.

Makes enough for 2 pounds of beef.

To use: Toss paper-thin slices (1 inch by 3 to 4 inches) of beef sirloin with the marinade in a nonmetallic bowl. Refrigerate 6 to 8 hours or overnight. Drain meat, reserving 3/4 cup of the marinade. Thread meat on bamboo skewers. Sauce: Remove and discard seeds from pasilla chile. Coarsely chop chile and cover with boiling water. Soak for 20 to 30 minutes. Drain, and put in a food processor with achiote paste and olive oil. Puree. Add the 3/4 cup marinade and blend until smooth. To use: Brush on skewers of meat. Broil or grill until meat is done, about 5 minutes, basting with marinade several times. Brush again before serving.

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