01 - Lay out the rye bread slices on a clean cutting board or work surface.
02 - Spread mustard evenly on one side of each bread slice, ensuring full coverage to the edges.
03 - Place a slice of Swiss cheese on two of the bread slices, positioning it to maximize coverage.
04 - Distribute half the corned beef slices evenly over each cheese-topped bread slice, creating an even layer without overstuffing.
05 - Arrange pickle slices and lettuce leaves on top of the corned beef layers as desired.
06 - Complete the sandwiches by placing the remaining bread slices on top, mustard side facing down.
07 - Slice each sandwich diagonally or vertically in half and serve immediately while bread remains fresh.