In a small bowl, whisk together the mayonnaise and spicy mustard until smooth and well combined.

Spread a generous layer of the sauce on one side of each slice of marble rye bread.

Don’t skimp on it—the sauce adds so much flavor and helps tie all the ingredients together.

Place one slice of bread sauce-side up on a plate or cutting board.

Layer the deli turkey evenly over the bread.

Place the Swiss cheese slices on top of the turkey, covering the meat from edge to edge.

Arrange the thinly sliced cucumbers in an even layer over the Swiss cheese

Layer the deli ham over the cucumbers, creating the final layer of filling.

Top with the second slice of marble rye bread, sauce-side down.

Gently press the sandwich together.

Cut the sandwich in half and serve immediately.

Enjoy with potato chips, a pickle spear, or your favorite deli-style side dish.