01 - In a small mixing bowl, thoroughly blend cream cheese, unsalted butter, dill, salt, and black pepper until smooth and fully incorporated.
02 - Spread an even layer of the cream cheese mixture onto each slice of crustless white bread using a butter knife or offset spatula.
03 - Arrange thinly sliced cucumber in overlapping layers atop four slices of the prepared bread.
04 - Place the remaining bread slices, cream cheese side down, over the cucumber-topped slices to form sandwiches.
05 - Gently press each sandwich, then cut each into quarters, either rectangles or triangles.
06 - Serve the sandwiches immediately, or cover with a lightly dampened paper towel and refrigerate until ready to serve.