Slow-Roasted Pork Shoulder with Peach Sauce

This is a recipe I saw on Amercia's Test Kitchen. I love how that show takes a scientific approach to cooking to get the best results. And this pork roast was absolutely the best I've ever had. AMAZING. You must try it! The meat was the most flavorful and tender possible and the peach sauce took it over the top. Doug didn't care for the sauce so much - he's anti-vinegar and mustard. But you must try it!

INGREDIENTS:

Pork Roast
1 Bone-In Pork Shoulder (also referred to as Butt), 6 to 8 pounds
1/3 C Kosher Salt
1/3 C Light Brown Sugar, packed
Black Pepper, ground

Peach Sauce
10 oz. Peaches, frozen (cut into 1-inch chunks (about 2 cups) -OR- 2 fresh peaches, cut into 1/2-inch wedges)
2 C Dry White Wine
1/2 C Granulated Sugar
1/4 C Unseasoned Rice Vinegar, plus 1 T (* I used a pear-infused vinegar instead)
2 Sprigs Fresh Thyme (* I used a sprinkle of dried thyme)
1 T Whole-Grain Mustard

INSTRUCTIONS:
Pork Roast
1. Using sharp knife, cut slits 1 inch apart in crosshatch pattern in fat cap of roast, being careful not to cut into meat.
2. Combine salt and brown sugar in medium bowl then rub salt mixture over entire pork shoulder and into slits.
3. Wrap roast tightly in double layer of plastic wrap, place on rimmed baking sheet, and refrigerate at least 12 and up to 24 hours.
4. Adjust oven rack to lowest position and pre-heat oven to 325-degrees. Unwrap roast and brush off any excess salt mixture from surface.
5. Season roast with pepper.
6. Transfer roast to V-rack coated with nonstick cooking spray set in large roasting pan and add 1 quart water to roasting pan.
7. Cook roast, basting twice during cooking, until meat is extremely tender and instant-read thermometer inserted into roast near but not touching bone registers 190 degrees, 5 to 6 hours.
8. Transfer roast to carving board and let rest, loosely tented with foil, 1 hour.
9. Transfer liquid in roasting pan to fat separator and let stand 5 minutes.
10. Pour off 1/4 cup au jus; discard fat and reserve remaining jus for another use.
11. After resting, using sharp paring knife, cut around inverted T-shaped bone until it can be pulled free from roast (use clean kitchen towel to grasp bone).
12. Using serrated knife, slice roast and serve, passing sauce separately.

Peach Sauce
1. While the roast is resting, bring peaches, wine, granulated sugar, 1/4 cup vinegar, 1/4 cup defatted au jus, and thyme to simmer in small saucepan.
2. Cook sauce, stirring occasionally, until reduced to 2 cups, about 30 minutes.
3. Remove thyme and stir in remaining T of rice vinegar and mustard.
4. Cover and keep warm.