To let him/her cook is to let them concentrate deeply on performing a certain activity. It is usually when they are doing it at a high
speed or doing sometimes ingenious
1) Concentrate deeply on performing a certain activity
> The activity is being
done at a high
speed
> The activity requires intellectual, physical, mental, social, economical, financial or social skills
Friend:
Yo can you do my English homework
Me:
aight sure
Other Person: *comes in* Hey guys want some
food
Me: *finishing 5000 word essay in 10 minutes*
Friends: nah let him cook