Roast Pork With Gravy without chicken

1 (3 -4 lb) center-cut boneless pork loin roast 2 tablespoons unsalted butter , at room temperature 2 tablespoons vegetable oil salt & freshly ground black[...]

1/4 cup unsalted butter 4 teaspoons ras el hanout spice mix 5 ripe pears , peeled, cored, each cut into 6 wedges 3 tablespoons olive oil 1 onion , chopped 9[...]