Rub the outer side of the top and bottom of each loaf with softened butter and arrange butter-side down on a cutting board. Spread 2 tablespoons of yellow mustard on the inside of each piece of bread.
On the bottom half of each loaf layer a quarter of the ham, followed by a quarter each of the pickle slices, roast pork and cheese. Season with salt to taste and close with the top half of the bread.
Heat up electric sandwich maker grill according to the directions. Then, working in batches, press the sandwiches until golden brown to where cheese has melted ( approximately 5 minutes) Transfer to a board and cut on a bias, then serve.