How do I make my wife eat my vegetarian cooking?
Are  you seriously making her eat vegetarian food, what if she doesn't want to?
She will get used to the idea if I insist
That isn't very nice of you. It is wrong to force someone to have the same lifestyle as you. This may not be something she wants to do all the time and you should respect her choices.
My wife is not originally from here so she doesn't have a choice. I will force her to eat vegetarian every day.
Even if she is not from here, she still has a choice of what she wants to eat. You can slowly introduce some dishes you want her to try but you need to accept it if you doesn't want to eat them. You could cause her to not want to be married to you if you don't respect her.