To make one sandwich, spread mustard on one side of a slice of whole-grain bread. Spread salad dressing on one side of a second slice of whole-grain bread. Combine mayonnaise and basil; spread on both sides of a slice of sourdough bread. Put a slice of turkey, a slice of cheese, and two spinach leaves on one whole-grain slice. Top with sourdough bread. Stack a leaf of romaine and a slice of ham on top of that. Cover with remaining slice of whole-grain bread. Secure with two bamboo skewers and slice.
Makes 8 double-decker sandwiches.