This book is written with some knowledge in cooking. Every society cooks because everyone need to eat. A person need basic meal to survive but a dessert basically mean the person live to eat.
It is a term used to describe a sub meal within a course of meal. Usually during the heaviest meal of any civilization such as dinner or banquet. It is usually serve at the end of the main meal to complete the whole meal and cannot do without it.
A civilization that has desert menu are those that have prospered with feudal or elite classes. A dessert literally transform any society from being just a need of a basic meal to survive into a society that we can say, ‘live to eat’ rather than ‘eat to live’.