Turnip crown

You must have a Dusty turnip in your inventory to have the option to get the Turnip Crown. There is only one such turnip, given at the beginning of the game, and it can be eaten before discovering the option to plate it.

You can give it to Norton at the end of the game so he doesn't steal the train, which could be done for a faster ending or speed runs.

Trivia

 * For some reason, the Turnip Crown can be silver plated, even though the Turnip Crown is already a silver plated turnip.