If I am going to make a turkey burger or chicken breast, and I need 3oz but I should weight it cooked, how do I know how big to make the portion before I cook it?
You won’t really know, it is hard to gauge, so you will just have to over-estimate (make it a big patty), then weigh it after you cook it and cut off any excess. It’s trial and error, eventually you will start to be able to gauge better about how big it will be to weigh close to 3oz. Maybe start with weighing out 4oz raw and see what it comes out to cooked (cooked will always weigh less than raw).