Step 1

Preheat oven to 400°F. Brush 1 1/2 teaspoons of the oil on a large rimmed baking sheet. Place bread bottoms on baking sheet. Spread 1 tablespoon mustard on each bread bottom, and top each with 3 Swiss cheese slices. Divide pork, ham, and pickles evenly on top of cheese. Top with 3 more Swiss cheese slices.

Step 2

Brush each top bread slice with 1 teaspoon of the pickle juice and remaining mustard; top sandwiches. Brush sandwich tops with remaining 1 1/2 teaspoons oil.

Step 3

Place a second large rimmed baking sheet on top of sandwiches, and press lightly. Place 2 cast-iron skillets on top of baking sheets to press sandwiches.

Step 4

Carefully place baking sheets with skillets in preheated oven, and bake until bread is toasted and cheese is melted, about 20 minutes. Cut each sandwich into 4 or 5 pieces.