Could I grate hamburger for lasagna before cooking it?

[tallandthin]

I would like to put ground hamburger in my lasagna. In order to make small pieces, could I grind it up raw or cook it, then grind it?

 

[MrsChief]

You could do it either way, but i think i would cook it first.

 

[Mountian_Baby]

It is already GROUND beef. You just stir it a lot when you cook it.