What is cured herring?

Cured herring is a type of fish that has been preserved through a process of salting and pickling. The herring is first cleaned and gutted, then salted and left to rest for a period of time. This process draws out the moisture from the fish and helps to preserve it. After the salting process, the herring is then typically put into a pickling solution that may include vinegar, water, sugar, spices, and other seasonings. This process further helps to preserve the fish and gives it a distinctive flavour. Cured herring is often eaten on its own, but can also be used in various dishes such as salads, sandwiches, and appetizers.