On a recent trip to Kyoto, I was eating at a Beef Katsu restaurant and one of the spices they made available for seasoning was described as "Japanese salt and pepper".
The spice blend was mostly white/black/gray in color, with no red.
The blend had really excellent flavor (compared to what I would expect for salt + black pepper), and now I'm curious what exactly it was composed of and whether it has a more distinctive name. Does anyone know?