Step 1

Preheat the oven to 275 degrees F.

Step 2

In a food processor, combine the peppercorns, garlic, and cloves and puree. While the motor is running, drizzle in the oil until a paste is formed. Using a rubber spatula, scrape the garlic paste into a small bowl.

Step 3

Place the pork butt on a work surface and season all over generously with salt. Rub all over with the garlic paste. Place in an oven-safe roasting bag and close with a twist tie. Place in a large roasting pan, and cook until tender, about 5 hours.

Step 4

Remove roast from the oven. Slip the oven-roasting bag off the meat and discard. Transfer the cooking liquid to a medium saucepan. Skim the fat from the cooking liquid with a ladle or de-greaser. Bring to a boil, lower the heat, and simmer to thicken the juices slightly.

Step 5

Raise the oven to 400 degrees F. Return the pork, in the roasting pan, to the oven. Continue roasting, basting frequently with the simmering cooking liquid, until well-browned, about 30 minutes. If there is any cooking liquid left, pour it over the pork.

Step 6

Remove pork from the oven and let it rest at room temperature for 10 minutes. With the pork drippings you may make a vinegar sauce using this formula: for every 1/2 cup of drippings, whisk with 3 tablespoons vinegar and 1/4 teaspoon salt. Either carve the pork into thin slices, or, using 2 forks, pull into small pieces. Serve with the vinegar sauce on the side.