1. Heat a large nonstick skillet over medium-high heat. Add lamb; sauté 5 minutes or until browned. Remove lamb from pan; place in a 4-quart electric slow cooker.
2. Drain tomatoes, reserving juice. Place flour in a small bowl; gradually add tomato juice, stirring with a whisk until smooth. Stir tomatoes, tomato juice mixture, onion, and next 7 ingredients (through garlic) into lamb. Cover and cook on LOW for 8 hours or until lamb is tender. Serve lamb curry over rice; top with yogurt, and sprinkle with cilantro.