01 - In a medium mixing bowl, combine softened cream cheese, sour cream, lemon juice, chopped dill, salt, and black pepper. Blend until completely smooth and well incorporated.
02 - Pat the finely diced cucumber dry with a paper towel to remove excess moisture, then gently fold it into the cream cheese mixture.
03 - Lay each flour tortilla flat on a clean work surface. Spread approximately one quarter of the filling evenly over each tortilla, extending all the way to the edges.
04 - Roll each tortilla tightly into a firm log shape. Wrap each roll securely in plastic wrap and refrigerate for at least 20 minutes to allow the filling to set.
05 - Unwrap each chilled roll and slice crosswise into 1/2-inch pinwheels. Arrange on a serving platter, garnish with fresh dill sprigs if desired, and serve chilled.