Whisk together the hoisin sauce, ginger, and sesame oil in a small bowl until well blended.
Place a sheet of wax paper down on work surface and spread sesame seeds.
Using a pastry brush, evenly spread hoisin mixture all over both pork tenderloins and roll in sesame seeds. Place pork onto a rack of a small roasting pan, tucking small ends under to help cook evenly.
Place in oven and roast 15 minutes, turn over and roast until meat thermometer reads 155 degrees F when inserted in the center, about 15 more minutes. Remove pork to a cutting board and let sit 5 minutes. (Internal temperature will rise 5 degrees upon standing). Slice pork into thin slices.