Pork Loin Sandwiches

Pork Loin:
1 1/2 pounds boneless center-cut pork loin
1 teaspoon vegetable oil
1/2 teaspoon salt
1/4 teaspoon pepper

Onion Jam:
1/2 cup sugar
1/2 cup cider vinegar
2 tablespoons honey
2 yellow onions, thinly sliced

Horshradish Aioli:
1/2 cup mayonnaise
2 teaspoons fresh lemon juice
1/8 teaspoon garlic, minced
2 teaspoons prepared horseradish
Dash cayenne
1 tablespoon extra virgin olive oil
6 hamburger buns
4 cups arugula, cleaned and dried
8 ounces smoked Swiss or smoked Gouda cheese, sliced

For the pork, preheat the oven to 425°F. Place the pork in a small roasting pan. Brush with oil; sprinkle with salt and pepper. Roast for 50 to 60 minutes until the center is slightly pink.

For the jam, combine the sugar, vinegar, and honey in a medium saucepan. Simmer until the sugar is dissolved. Add the onions and cook over medium heat until the onions are tender and golden, and most of the liquid has been absorbed, 20 to 25 minutes. Set aside to cool.

For the aioli, combine the mayonnaise, lemon juice, garlic, horseradish, cayenne, and olive oil in a small bowl. Set aside.

To assemble the sandwiches, slice the pork very thinly. Toast the buns, and spread both of the cut sides with aioli. Top with arugula, several slices of pork, the jam, and cheese. Serve warm, or grill as a panini.