I like cooking.  Cooking is the art and technique of preparing food for consumption with or without the use of heat. 
I also enjoy cooking sometimes, but it takes so much time.
Cooking effectively is highly dependent on skill and type of training the individual has. 
That is true just as with almost everything we do.
Preparing food through the use of heat and fire is uniquely human activity. 
Never thought about that, but I guess it is true.
Cooking may have started 2 million years ago.  But the most recent archaeological evidence goes back 1 million years. 
What was cooked 2 million years ago?
Animals hunted I would guess. The inventions of pottery for holding and boiling water expanded the way early humans cooked though. 
I wonder what made them decide to heat it.