Rinse pork and poke holes throughout with a fork. Combine 3 tblsp hoisin, 1/4 cup sugar, soy sauce, peanut butter, and vinegar in a bowl. Add pork so it is completely submerged and let sit, refrigerated, for at least half an hour- overnight is best. When ready, heat oven to 450 degrees F and rinse pork of the brine. In a new bowl, combine the white pepper, 5-spice, sesame oil, ginger, garlic, ketchup, honey, 3 tblsp hoisin and 1/4 cup sugar. Set about 1/2 cup aside to use during basting. Line a sheet pan with aluminium foil and arrange the pork in the center of the pan. Spoon or brush the remaining marinade on all sides of the pork and place in the center of the oven. Roast for roughly one hour, basting and turning over at least once, until the internal temperature reaches 100*F.