Season turtle meat with salt and pepper. Coat a large cast-iron skillet with the oil. Render the turtle meat (cook until brown) at a medium to high heat. Remove the meat from pot. Reduce heat to medium. Add onions, celery, bell pepper and garlic and cook until tender. Slowly whisk in flour to make a “roux.” Return the turtle meat to the pot. Add tomato sauce and 1 cup of water. Cook for 30 minutes. Add lemon, bay leaves, Worcestershire sauce and 4 quarts of water (you may use stock instead). Reduce heat to low and simmer uncovered until soup reaches desired thickness. Serve with boiled eggs and sherry to taste.