The dish consists of soft-cooked spaghetti, tomato ketchup, onion, button mushrooms, green peppers, sausage, bacon and optionally Tabasco sauce.

[1] Naporitan was created by Shigetada Irie (入江茂忠), the chef of the Hotel New Grand in Yokohama, for general Douglas MacArthur.

Because available ingredients were limited after World War II, he had to use what was on hand for the general, who lived at the hotel with his wife.

[1] The chef named the dish after Naples, Italy (hence "Napoli").

Thus when converting katakana back into English, based solely on the Japanese spelling in the English alphabet is ambiguous and can vary.