Satmar Wiliamsburg is a bit slim pickings when it comes to food, except for this bakery. Amazing Chocolate bread, made with high quality chocolate swirled into a nice loaf. Its expensive (something like 15$ for a whole loaf), but worth it.
In addition they make a pretty mean Challah, and I believe its been debated on this board as one of the best in the city.
188 Lee ave (right near Rutledge)
I been coming here for over ten years. It may seem a bit unwelcoming from the outside, but everyone who works there is super sweet and loves to talk.
Here are two pictures from the bakery.