Reserve 12 Fehlbergs Pickled Sandwich Stackers, finely chop the rest and mix together with mayonnaise, sour cream, ketchup, and Worcestershire to make the dressing.
Butter bread slices on one side and toast under a hot grill on the buttered side.
Turn over, spread with dressing, and top with cheese.
Grill until cheese melts.
Top 6 slices with pastrami, sauerkraut, reserved Sandwich Stackers, and a squeeze of mustard.
Sandwich together with remaining grilled bread and serve with Fehlbergs baby cucumbers and pickled onions.