Step 1

Trim fat from meat. Cut meat into six serving-size pieces. Place pieces in a 3-1/2- or 4-quart slow cooker. In a medium bowl combine brown sugar, soy sauce, Worcestershire sauce, jalapeño peppers, vinegar, tapioca, and garlic. Stir in cilantro. Pour mixture over meat in cooker. Top with mushrooms and onion.

Step 2

Cover and cook on low-heat setting for 9 to 10 hours or on high-heat setting for 4-1/2 to 5 hours or until steaks are tender. If desired, sprinkle with cilantro just before serving. If desired, serve with hot cooked polenta.