Take the peeled hard-boiled eggs (cooled) and cut them in half lengthwise.
With a small spoon, carefully remove the yolk and put it into a small mixing bowl and break the yolk apart with a whisk or fork. Place the white of the egg onto a serving platter.
Add the mayonnaise, truffle oil, pickle juice, salt and pepper and whisk the ingredients vigorously until smooth.
Put the egg yolk mixture into a piping bag (optional if you want it to look pretty) and evenly pipe the filling into the center of each egg white.