Start by washing and thinly slicing the cucumber. For best results, use a mandoline or a sharp knife to ensure even slices. Place the slices on a paper towel to absorb any excess moisture.

In a small bowl, combine the softened cream cheese, chopped dill, lemon juice, salt, and pepper. Mix until smooth and well combined.

Lay out the slices of bread and spread a generous layer of the cream cheese mixture on each slice. Arrange the cucumber slices evenly over the cream cheese on half of the bread slices. Top with the remaining bread slices to form sandwiches.

Using a sharp knife, carefully cut off the crusts and slice each sandwich into smaller rectangles or triangles.

Garnish with fresh mint or chives if desired. Serve immediately or chill in the refrigerator for up to an hour before serving to allow the flavors to meld together.