Preheat oven to 450°F Rub pork roast liberally with salt and five-spice powder. Place in roasting pan, place pan in oven, and roast undisturbed 15 minutes.
Meanwhile, stir together marinade ingredients until well combined.
Pour 1/2 c of marinade over the roast. Lower heat to 325°F Baste meat with 1/4 c of marinade every 15 minutes; if there is enough liquid in the bottom of the pan use that instead.
Roast 75-105 minutes, until the internal temperature is 145-150°F Remove from oven, tent with foil and let rest 10-15 minutes before carving. If there is any marinade left over, it can be drizzled over the meat as is, or reduced in a small saucepan to make a glaze, then drizzled over the meat.