Preparation

• 在一个小锅中，将红糖，盐和2杯水混合。用高火煮沸，搅拌以完全溶解糖和盐。
• Remove from the heat and pour into a large metal bowl. Stir in ice cubes until the mixture is cooled. It should take about a quart of ice cubes. Pour the brine into a gallon-size zip-top bag and add the pork. Squeeze out excess air and brine the meat for 1 hour. Remove the pork from the brine and pat completely dry. Brush the tenderloin with 1 Tbs. oil and season on all sides with pepper.
• Heat a grill to medium heat. Grill the pork, with the grill top closed, for 5 minutes, then flip and grill for 5 minutes more, and repeat on the final side until the interior temperature reaches 145°F. If using a grill pan, heat over high heat, and grill the pork covered with a domed lid for the same times. Transfer the pork from the grill to a plate and tent with aluminum foil to keep warm. The pork will cook a little more as it rests. The pork needs to rest for about 15 minutes before slicing. Make the sauce during that time.
• Heat a skillet over high heat, add the remaining 1 tsp. oil to coat the bottom of the pan, and swirl until shimmering. Add the carrots, celery, and onion, lower the heat to medium, and cook, tossing occasionally until the onions are translucent and soft, about 3 minutes. Remove the pan from the heat, add the whiskey, and carefully tilt the pan away from you, toward the flame (if you have a gas stove), to ignite the whiskey. You can also use a long match to ignite the whiskey. Toss the vegetables and agitate the pan until the flames burn out. Add the stock and cream, bring to a boil, and continue to cook until the liquid is reduced in volume by half, about 5 minutes.
• Strain the sauce into a bowl and discard the vegetables. Return the sauce to the skillet, and stir in the mustard and peppercorns. Return the sauce to high heat and bring to a simmer. Remove from the heat, swirl in the parsley, and add salt and pepper to taste. Serve a spoonful of sauce over each slice of pork.