Autumn/Winter growing in a blowaway greenhouse?

So, went to Munich and came back and everything in my blowaway greenhouse was dead.

So I want to put the greenhouse to some use (normally they get destroyed by the snow/hailstone before the following year).

I've been thinking about maybe onions? Would they thrive from being sown now whilst it's still hot? and how long would it take before they were ready to pick?

All help is fantastic!

 

I'll be interested to hear any suggestions on this topic too, Kyle: good question.

Anyone?