You have a toddler human, about 18 months old, and you want him to eat his broccoli. He doesn't like it! So you stop giving him any other food for 2 days, other than the broccoli, in an effort to force him to eat it.
It is highly unlikely that this will work. That toddler will start to eat his veggies when he is ready, hopefully trying little bites of them here and there, finally deciding they are not so bad after all.
Not being able to have a conversation with a dragon to argue the benefits of a salad makes trying to starve them into eating greens a bad idea. The dragon will not understand what you are trying to do and may become overly aggressive with their food when it does come to them.
Maybe try putting some tiny worms in the salad to entice your dragon. Just remember, every one is individual. Give it some time to come to terms with greens on it's own.
Good luck!
Sharla