Let the pork loin stand at room temperature for about 1 hour
Place pork loin fat side up on a V-rack
Roast at 250°F for about 1 hour and 30 minutes, allowing air to circulate around the meat
Toss pears and raisins with vinegar
Increase oven temperature to 450°F and add the pear and raisin mixture to the pan with shallots
Continue roasting until the pork, fruit, and shallots are caramelized and a pan sauce forms
