Owakudani, located in Hakone, is famous for its volcanic activity and the hot springs created by Mount Hakone's last eruption 3,000 years ago. One of the unique local specialties connected to this geothermal activity is the Kuro-tamago, a hard-boiled egg that turns black due to a chemical reaction with the sulfuric hot spring waters. These eggs are said to add seven years to your lifespan when consumed. While the area is not as widely known for a diverse culinary history, the geothermal activity has influenced the food culture significantly, making it an interesting destination for those looking to experience food in a unique setting.