You can Google the great roast pork recipe and find it without having to sign up. Simply type in... Cook's Country old fashioned roast pork recipe...and several versions (other than the Cook's Country site) will come up. The first two I saw were Food.com and Butteryum Blog Spot, there are several others also.
They might give a better explanation for the cooking process.
I have one in the oven right now, for 2 1/2 more hours. I'll strain the juices and onions, then refrigerate until tomorrow. It literally melts in your mouth.