Lemons first came to Japan some 150 years ago, and have since been bred with Japanese citrus fruits to create new strains. We journey to a tiny island in the Seto Inland Sea, where about a quarter of Japanese lemons are grown, and discover its unique lemon-friendly climate and topography. We also see the surprising ways lemon farmers use lemons in Japanese cuisine from tempura to hot pot. Last but not least, we pucker up for some delicious lemon-based sweets.