Drain the tuna and let it drain well. Puree tuna and cream cheese. Season with salt, pepper and lemon juice. Wash cucumber hot and rub dry. Halve the cucumber and remove the seeds with a teaspoon.
Straighten the lower halves of the cucumber (so that the shuttle stops later). Cut the cucumber halves diagonally into pieces. Fill tuna cream into a piping bag with star-shaped spout and fill the cucumber pieces with tuffs.
Wash the basil and dab dry. Arrange cucumber boats with basil. Garnish with caper apples and pink berries.