In a large mixing bowl, using an electric mixer, blend together the cream cheese, sour cream, mayonnaise, dill, lemon juice, and pepper until creamy.
Transfer the cream cheese mixture to a piping bag. Pipe evenly into each cucumber boat.
Top each cucumber bite evenly with smoked salmon, red onion, and capers.
Tips and Substitutions
Cut the cucumber in half, then use a regular tablespoon to scoop out the center of the english cucumber.
When filling the cucumbers, place a sandwich baggie in a glass much and transfer the cream cheese mixture to the baggie. Snip an end off the corner of the baggie and pipe the stuffing into the hollowed out cucumber.