Preparation

Brine the pork

• In a bowl just large enough to hold the tenderloins, combine the salt and sugar with 4 cups cold water and stir until dissolved. Add the hoisin and soy sauces, the Scotch, maple syrup, garlic, ginger, and five-spice powder. Submerge the pork in the brine, cover, and refrigerate for at least 6 hours and up to 12 hours. (Alternatively, you can brine the pork in a large zip-top bag.)

Glaze and roast the pork

• Position a rack in the center of the oven and heat to 425°F.
• In a small saucepan, combine the hoisin sauce, maple syrup, sugar, Scotch, sesame oil,and ginger, and cook over medium-low heat, stirring occasionally, until the mixture comes to a boil. Remove from the heat.
• Line a rimmed baking sheet with foil, then set a large wire rack on the sheet. Take the tenderloins out of the brine, shaking off any excess. Pat dry with paper towels, and place on the rack. Brush both with about half of the glaze. roast for 7 minutes, brush with about half of the remaining glaze, and roast until the pork registers 130°F to 135°F on an instant-read thermometer, another 10 to 15 minutes. Remove the pork from the oven and heat the broiler on high. Brush the pork with the remaining glaze, and broil, checking often, until it bubbles and begins to darken, 1 to 2 minutes.
• Transfer to a cutting board, cover loosely with foil, and let rest for 5 minutes. Slice and serve with the scallions.