24-48 hours before the meal, add all the marinade ingredients to a large tupperware or ziplock. Pat the pork dry with paper towel and season all sides with salt and pepper. Add to tupperware and leave in the fridge to marinade. 

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Remove from fridge an 1.5h before you want to eat. Preheat oven to 375°F and prepare a baking sheet with a tight foil wrap and a rack. This will make your clean up much easier.

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Let the pork sit in room temperature for 20 minutes before placing on the baking sheet. Spoon extra sauce on each, and then bake for 40-45 minutes.

 

Pour extra marinade sauce into a small sauce pan. 5 minutes before pork is finished, bring to a boil and then down to a simmer to thicken. Stir occasionally to keep desired consistency.

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When char siu is cooked remove from the oven. Spoon extra sauce again on to each loin, leaving extra for dipping later, and then return to the oven to broil for an extra 2 minutes for a bit more char. Serve right away with extra sauce.