My wife bought some cakes (I don't know what the cake is called) for my son as shown in the above picture. There was some cream (butter or milk or whatever) inside the core of each cake.
Normally, he was supposed to eat the cake with its butter together. But he put his finger into the core of the cake and ate the butter separately, which smeared butter all over his hands.
How to express to eat something all together without eating each parts of it separately?
For example, can we say "please eat it as a whole"?