01 - In a medium bowl, blend together cream cheese, sour cream, lemon juice, dill, salt, and black pepper until smooth.
02 - Pat diced cucumber dry with a paper towel to remove excess moisture, then fold cucumber into the cream cheese mixture.
03 - Lay out each tortilla on a flat surface. Spread about one quarter of the mixture evenly over each tortilla, all the way to the edges.
04 - Roll each tortilla up tightly into a log shape.
05 - Wrap each roll in plastic wrap and refrigerate for at least 20 minutes to firm up.
06 - Unwrap and slice each roll crosswise into 1/2-inch pinwheels.
07 - Arrange pinwheels on a platter and garnish with extra dill if desired. Serve chilled.