In a medium bowl, whisk together the soy sauce, white wine, garlic, ginger, mustard, and thyme.
Place the pork loin roast in a large resealable food storage bag, and place the bag in a bowl or dish (just in case it leaks!).
Pour the marinade over the top and refrigerate overnight, or up to 24 hours.
Preheat oven to 325°F.
Place the roast on a rack in a shallow roasting pan. Discard marinade.
Bake for 2–2½ hours. A meat thermometer inserted into the thickest part should register 145°F.
Let the roast stand for 10 minutes before slicing.
Video
Notes
Don't have dried mustard? Substitute 2 tablespoons of dijon mustard instead. You can also substitute 2 teaspoons of fresh grated ginger for the ground ginger.No white wine? Broth works well as a substitute. Here's a temperature chart for your desired doneness:
Medium rare: 145–150°F
Medium: 150–155°F
Medium well: 155–160°F
Well: 160°F
Store any leftover pork in the refrigerator for up to 5 days. It reheats well in the microwave or oven. It can be re-purposed for tacos, quesadillas, and fried rice, too!