Step 1

Heat oven to 375°F. In small bowl, place dried porcini mushrooms. Cover mushrooms with hot water; let stand 10 minutes.

Step 2

Meanwhile, cut pork roast horizontally to 1/2 inch from one long side without cutting all the way through (pork will open like a book); set aside. In 10-inch skillet, melt butter over medium-high heat. Add onion; cook and stir about 1 minute or until tender.

Step 3

Drain porcini mushrooms well; chop. Add porcini and portabella mushrooms to butter in skillet; cook about 4 minutes, stirring occasionally, until mushrooms are tender. Stir in stuffing crumbs.

Step 4

Spoon mushroom mixture into opening in pork; close pork over stuffing and secure with string. Place stuffed pork in shallow roasting pan. Brush with oil; sprinkle with salt and pepper. Insert ovenproof meat thermometer so tip is in center of thickest part of pork.

Step 5

Roast uncovered 45 to 55 minutes or until thermometer reads 150°F. Remove pork from pan; cover with foil and let stand 10 minutes until thermometer reads 160°F. Remove strings from pork before carving. Garnish with sage.