Saute flour in oil until well browned. Saute onion in butter for 6 minutes. Add celery and bell peppers. Saute for 6 minutes. Combine flour mixture with onion mixture. Add broth, lemon juice, thyme, hot sauce, salt and pepper. Cover and simmer for 1 hour. Add sherry and beans. Simmer for 10 minutes. Serve garnished with egg and parsley.