Using frozen spinach for spinach lasagne

Hi Lindsey

I want to use frozen spinach to make Delia's spinach and ricotta lasagne with pine nuts. I understand I should use@ 200g of frozen spinach.

My question is: the frozen spinach I have is in balls. Do I cook these first to defreeze them as per pack instructions, then drain and then weigh for 200g? Then use them in the recipe as instructed?

Thanks - Judy