Icing on the cake

means something good that happens in addition to another good thing. Another expression says

you can’t have your cake and eat it, too

. This means you cannot have everything your way, especially if two wishes oppose each other.

Hotcakes are also called pancakes. They contain flour, eggs, milk and baking powder. You cook them in a frying pan and eat them with fruit or a sweet topping. If a new product is popular and selling well, you might say it is

selling like hotcakes

.

But if a friend of yours did something bad, you might stop being friends with him immediately or

drop him like a hotcake

.

Flat as a pancake

describes something that is, well, really flat.

A tough cookie

is not something you want to eat. It is a person who is difficult to deal with, and would do anything necessary to get what he or she wants. This person could be

a sharp cookie

or someone who is not easily fooled. Very often things do not go the way we planned. Instead of getting angry or sad, you might just accept it and say

that’s the way the cookie crumbles.

Many pies are also good to eat. If something is easy to do, you could say it is

easy as pie

. But if you do something wrong or bad, you might have to apologize and show you are sorry. In other words, you might have to

eat humble pie.

If you have an idea or plan that is not really possible, someone might say it is