Can I thaw frozen spinach that´s meant to be boiled frozen?
In my experience frozen spinach will never be close to fresh, so I guess it depends on what sort of consistency you are hoping to get. In any case boiling from frozen sounds like the world's worst way to prepare it! There is no reason you can't thaw it before you cook it, but I wouldn't boil it in any case. I'd that it and drain it well, maybe even squeezing excess water out of it before pan frying it. Season it well with salt and pepper, a bit of butter never hurts.