Japanese mustard refers to oriental (yellow) mustard and is a condiment with a strong spiciness. It is used for cooking Japanese and Chinese food. Western style mustard refers to white mustard, which has a more subtle flavor and fragrance and is not as spicy. It is used for sandwiches and sausages. Whole grain mustard is made by mixing white mustard with black mustard seeds and used for things like flavoring vinegar. Sushi chefs use Japanese mustard to offset the greasiness of fatty fish such as bonito and tuna.
Fish seasons are categorized as the ‘catch season’ and the ‘flavor season’. The ‘catch season’ is the time when lots of fish can be caught and are cheap. Take Japanese Spanish mackerel (Sawara), for example, they approach the coasts during the spring to spawn and this is the peak season. This is the catch season. Once they’re about to spawn and their bodies fatten for winter, we’ve entered the tasting season. However, these seasons differ depending on the region, and may be longer or even happen twice a year.
We hope this information will be helpful.