Answer:
What can be opened but cannot be closed?
A wonderful elixir, It is your fluid fixer. Gulp it down and turn like a concrete mixer. Dark as night and sweet as sin, It's like liquid heroin.
I'm very tempting, so it's said, I have a shiny coat of red, and my flesh is white beneath. I smell so sweet, taste good to eat, and help to guard your teeth.
The warmer I am, The fresher I am.
Before crust hardens.
The profession of Jimi Hendrix and Eric Clapton
Food
Animal
Difficult
Easy
Funny
Kids
Logic
What am I?