Spanish Cuban Sandwiches

Name: Spanish Cuban Sandwiches
Ingredients: 1/2 cup mayonnaise; 4 Cuban rolls or 1 loaf Cuban bread, halved; 8 ounces Manchego cheese, thinly sliced; 8 ounces Serrano ham, thinly sliced; 4 cups pulled Spanish Spice Rubbed Pork Butt; 2 cups baby arugula; 1/4 cup Dijon mustard; 1/2 cup Piquillo Pepper Butter, recipe follows; Piquillo Pepper Butter:; 2 sticks unsalted butter, slightly softened; 4 piquillo peppers, patted dry and chopped; 4 cloves garlic, chopped; 2 teaspoons chopped fresh thyme; 1 teaspoon Spanish paprika; 1 teaspoon kosher salt; 1/4 teaspoon freshly ground black pepper