Antojar is a verb that has a variety of uses and is difficult for beginners to master. This should stat you on your way.
A su antojo – to do as one pleases
Example:
Quiero hacerlo a mi antojo – I want to do it my way
Antojar – to crave, to take a sudden fancy to; to Imagine
Example:
Se me antojó bastante dificil
