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Step 1
Whisk the mayonnaise, cream cheese, salt and pepper together in a large bowl then stir in the lemon juice until smooth.
Step 2
Stir in the red onion and chives then stir in the tuna just until combined.
Step 3
Cover and refrigerate for at least 30 minutes.
Step 4
In the meantime, cut the ends off the cucumber then cut each one into thirds.
Step 5
Slice each third in half lengthwise then scoop out the seeds using a spoon.
Step 6
Turn them upside down on a paper towel to let any excess water drain out while the tuna chills.
Step 7
Fill the cucumber halves with 2-3 tablespoons of the tuna filling and serve immediately with a sprinkle of freshly chopped chives for garnish if desired.