Chef John's Cuban Sandwich

Details

Ingredients

• ¼ cup mayonnaise
• ¼ cup mustard
• 1 pinch cayenne pepper
• 1 (8 ounce) loaf Cuban bread
• 8 slices Swiss cheese
• 6 thin slices smoked fully-cooked ham
• 1 ½ cups cooked pulled pork, heated
• 1 large dill pickle, sliced thinly lengthwise
• 2 tablespoons butter, or as needed