If in some yet-to-be-explained plot twist the British TV show ¡°Downton Abbey¡± winds up in Osaka, expect Kitahama Retro to play a starring role. It¡¯s period perfect ¡ª right down to the maid in her pinafore, the linen curtains, silver-service tea sets and giant egg omelet sandwich. It¡¯s a recipe for...