Plum crumble do I need to cook the plums first?

[bobbyboboo]

I have loads of plums which have gone quite soft and thought i would make them into a crumble. Do I need to peel the plums? and would they need cooking first? Any advice grateful only ever made apple before. Many thanks.

Yummy!

I just cut in half and take the stones out, but don't peel or pre-cook.

Enjoy!

Thank you so much. Am off to prepare.