What is seasonal food?

Answer 1

Seasonal food would apply to areas that have seasons, as in winter or summer. Therefore lettuce is seasonal food that is locally available in summer for those areas that get winter. However, today food does get shipped long distances so you may still be able to buy lettuce in the winter in most of North America.

Another example would be for the foods from the sea. Here in season would be those times that fishing is permitted. This is to allow for fish, lobster etc. to reproduce.