Mix 1/4 cup gravy, orange juice, garlic, ginger and seasonings until blended. Place roast, fat side up, in roasting pan sprayed with cooking spray. Spread evenly with gravy mixture.
Bake 3 to 3-1/2 hours or until done (145°F). Transfer roast to cutting board, reserving drippings in pan. Cover roast loosely with foil.
Skim and discard fat off surface of drippings in pan. Add water to drippings; stir to scrape browned bits from bottom of pan. Pour into saucepan. Stir in remaining gravy. Bring to boil on medium-high heat, stirring constantly.
Slice roast. Serve with gravy.