Poison apple pub

Safe at last. You're in the bar famous far and wide, where even King Harold has been looking for a hitman for Shrek. The woman behind the bar is Doris, Cinderella's more attractive stepsister, well, at least that's what she thinks. There's karaoke in the bar today, you know what that means? Doris wants to help you and has been looking in her files for the potion spell, but you have to help find the ingredients - a boy's consciousness, an ogre's essence and a hero's hair!

Hints:
No age or size restriction
Picture: Shrek's Adventure! London