Bistec Encebollao (Puerto Rican Beef Stew)

[Chowhound]

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2 pounds beef sirloin steak, sliced thinly across the grain
1/2 cup olive oil
2 tablespoons minced garlic
1 pinch dried oregano
1 (.18 ounce) packet sazon seasoning
2 large white onions, sliced into rings
1/4 cup distilled white vinegar
1 cup beef stock
1 teaspoon salt

In a large resealable bag, combine the steak, olive oil, garlic, oregano, sazon seasoning, onions, vinegar, beef stock, and salt. Seal and shake to mix. Refrigerate for at least 4 hours, or up to a couple of days. When you are ready to cook, dump the entire contents of the bag into a large deep skillet. Bring to a boil, reduce heat to low, cover and simmer until the beef is fork tender, about 40 minutes.