Slow Cook:10 hrs to 11 hrs (low) or 5 to 5 1/2 hours (high)
Beef Lettuce Wraps with Miso-Yogurt Sauce
Place 3/4 cup of the onion in a 3 1/2- or 4-qt. slow cooker. Add the water. Sprinkle meat with five-spice powder and salt. Place meat in cooker, cutting to fit if needed. Cover and cook on low 10 to 11 hours or high 5 to 5 1/2 hours.
Meanwhile, in a medium bowl combine remaining 1/4 cup onion, tomatoes, mango, and crushed red pepper. For sauce, in a small bowl combine the next four ingredients (through lime juice). Cover and chill tomato mixture and sauce until ready to serve.
Remove meat from cooker, reserving cooking juices. Shred meat using two forks; place in a bowl. Using a slotted spoon, transfer onion to bowl with meat. Add 1/2 cup of the cooking juices; toss to combine.
Divide meat mixture among lettuce leaves. Top with tomato mixture and sauce. Fold lettuce up around filling. Serve with lime wedges.