In a deep skillet or stew pot, brown the meat in oil. Add onions, carrots, Worcestershire sauce, bay leaf, oregano, and broth. Simmer, covered for 1/2 -1 hr, or until meat is tender. Add potatoes. Simmer for an additional 1/2 hour. Combine flour and water. Stir into stew. Remove bay leaf. Taste it and add salt and pepper to taste.