Combine raisins and rum in a small bowl; let stand 30 minutes.
Trim fat from steak, and cut steak into thin strips.
Heat oil in a large nonstick skillet over medium-high heat. Add onion, bell pepper, and jalapeño, and sauté 10 minutes or until tender. Add steak and garlic, and sauté 4 minutes or until beef is browned. Add raisin mixture, capers, thyme, cumin, olives, and tomatoes. Reduce heat; simmer 7 minutes or until steak is done, stirring occasionally. Serve over rice.