Sourdough pain de mie

I just got this awesome pan from amazon 

http://www.amazon.com/USA-Pans-Pullman-Aluminized-Americoat/dp/B002UNMZPI/ref=cm_cmu_up_thanks_hdr

And I had a lot of sourdough on my hand so I went ahead and made King Arthur king recipe at thie link 

http://www.kingarthurflour.com/recipes/pain-de-mie-with-a-starter-recipe