In a small mixing bowl, combine the softened butter, finely minced garlic, chopped parsley, salt, black pepper, and red pepper flakes (if using). Mix until well combined to create the garlic butter.

Preheat your oven to 375°F (190°C). Carefully slice the Cuban bread lengthwise, being careful not to cut all the way through, creating a 'hinge' on one side. Spread the prepared garlic butter generously on both cut sides of the bread.

Place the buttered bread, cut-side up, on a baking sheet. Bake for 8-10 minutes, or until the butter is melted and bubbling, and the edges are lightly golden and fragrant. Remove from the oven.

On the bottom half of the toasted garlic bread, spread the yellow mustard evenly. Layer 4 slices of Swiss cheese on top of the mustard. Then, add the warm roasted pork, followed by the thinly sliced ham, and finally the dill pickles. Place the remaining 4 slices of Swiss cheese on top of the pickles.

Carefully close the sandwich. Heat a large griddle or a heavy-bottomed non-stick pan over medium heat. Place the entire sandwich (or cut it into halves for easier handling) onto the hot griddle.

Place a heavy object (like another baking sheet topped with a heavy can or a foil-wrapped brick) on top of the sandwich to press it down firmly. Cook for 4-6 minutes per side, or until the bread is golden brown and crispy, and the cheese is thoroughly melted and gooey.

Remove the pressed sandwich from the griddle. Slice into individual portions (typically 4-6 pieces depending on the loaf size) and serve immediately. Enjoy your Cuban Garlic Bread Sandwiches!