Basically take some skin-on pork belly, rub it with salt and spices and some sugar, and let it sit in your fridge for a week (in a container or plastic bag). Remove it, wash it off and let it sit in the fridge for another day. Then dry it (in a low oven), cool, wrap it tight and refrigerate until ready to use.

This is a pretty good article on it:http://ruhlman.com/2010/10/home-cured-bacon-2/ and I've also watched a video on YouTube that walks you through it.