Combine the first seven ingredients in a 6-qt. electric pressure cooker. Add roast and turn to coat. Lock lid; close pressure-release valve. Adjust to pressure-cook on high for 25 minutes. Let pressure release naturally for 10 minutes; quick-release any remaining pressure. A thermometer inserted in pork should read at least 145°.Press cancel.
Remove pork to a serving platter; keep warm. In a small bowl, mix cornstarch and water until smooth; stir into pressure cooker. Select saute setting and adjust for low heat. Simmer, stirring constantly, until thickened, 1-2 minutes. Serve with pork. Freeze option: Place sliced pork roast in freezer containers; top with sauce. Cool and freeze. To use, partially thaw in refrigerator overnight. Heat through in a covered saucepan, stirring gently and adding a little water if necessary.