You can find the recipe in it's entirety here.
I didn't change anything about recipe. It is perfect the way it is. You need to press the sandwich for a few hours prior to the devouring and you should have seen all the physics text books I had stacked on top in my office. It was comical.
My husband thought this needed a creamy layer, like a mozzarella cheese. Maybe some tofu would suffice? I thought it was great.