Delicious Slow Cooker Cuban Sandwiches with Mojo Pork

Ingredients

• 3 lb (1.36 kg) boneless pork shoulder or pork butt
• 1 cup (240 ml) fresh orange juice, from about 3 oranges
• 1/3 cup (80 ml) fresh lime juice, from about 3 limes
• 6 cloves garlic, minced
• 2 teaspoons ground cumin
• 2 teaspoons dried oregano
• 1 1/2 teaspoons kosher salt
• 1 teaspoon black pepper
• 1/4 teaspoon cayenne pepper, optional
• 2 Cuban bread loaves or sturdy Italian loaves, cut into 8 sandwich portions
• 4 tablespoons (56 g) unsalted butter, softened
• 1/3 cup (80 g) yellow mustard, plus more to taste
• 12 oz (340 g) sliced Swiss cheese
• 12 oz (340 g) thinly sliced deli ham
• 16 long dill pickle slices