Cooking allows you to cook meat and other raw food to make them safe to eat.
On Angel Island, Cooking can also be used to seal weapons with wax in order to make them immune to damage from Corrosion.
Cooking is a straight skill check. This means that you can go from 0.0 to 100.0 doing any valid check.
For cooking, you can do fishsteaks all the way to GM for example. In essence, you can fish a moderate number of fishsteaks and then cook them one at a time.