Heat oil in a large Dutch oven over medium-high heat. Add chicken; cook 3 minutes on each side or until browned. Remove chicken from pan. Add onion and shallots to pan; sauté 3 minutes or until lightly browned, stirring occasionally. Stir in cider, raisins, juice, salt, curry, and pepper. Add chicken; bring to a boil. Cover, reduce heat, and simmer 5 minutes. Uncover and cook 25 minutes, turning chicken occasionally. Stir in plums; cook 5 minutes.