Hard boil eggs if you have not already done so. Split eggs in half, and separate out the egg yolks. Place egg yolks into a medium sized bowl. Mince yolk with a fork until the yolks have a fine uniform texture. Mix in mayonnaise, mustard, red onion, smoked paprika, and dill pickle relish. Stir until well blended. Spoon mixture into egg white shells. Sprinkle with paprika. Top with capers if desired.