Combine flour, sea salt, and pepper. Dredge chicken in flour mixture. Reserve excess flour mixture.
Brown chicken in olive oil in a large skillet. Add 1 cup broth, cover tightly, and cook over low heat for 30 minutes. Stir in curry powder. Add celery; cover and continue cooking for 15 minutes.
Combine reserved flour with remaining 1/4 cup broth, mixing well. Stir into chicken mixture. Add dried plums and continue cooking for 15 minutes, or until meat and celery are tender, stirring occasionally. Add more broth if mixture seems dry. Stir in cauliflower and heat through.