Preheat a panini press or large skillet over medium heat.

Slice your baguette in half lengthwise, then cut into two equal portions to make two sandwiches.

In a small bowl, mix the mayonnaise and Dijon mustard until well combined.

Spread the butter on the outside of each bread piece (this will help create that perfect golden crust when grilled).

Spread the mayonnaise-mustard mixture generously on the inside of each bread piece.

Layer each sandwich with a slice of Swiss cheese, followed by equal portions of ham and pulled pork.

Arrange pickle slices evenly over the meats.

If using, drizzle the Italian vinaigrette lightly over the fillings and add lettuce and tomato.

Top with another slice of Swiss cheese and the second piece of bread.

Press the sandwich firmly and place in the panini press (or in a skillet, weighted down with another heavy pan) for 3-4 minutes per side until golden brown and the cheese is melted.

Remove from heat, let cool for 1 minute, then slice diagonally for that classic deli presentation.

Serve immediately while hot and crispy.