Salted mackerel fillet, also known as "shio saba," features wild Boston mackerel sourced from Norway and preserved with salt. This traditional preparation enhances the fish's natural flavors while preserving its freshness. Shio saba offers a savory and slightly briny taste, making it a delicious addition to various dishes, from sushi to salads. With its rich flavor and firm texture, it's a versatile ingredient that adds depth to any meal.