The most used method is to add the honey at "flameout", but the heat does drive off the aroma, another method is to boil some water, let it start to cool, sanitize the container holding the honey and mix the honey into the warm water, and add to the secondary prior to racking. Works well for me but it is just another option.
You could even rack on top of the pure honey and just mix it up afterwards but I would not want to aerate it any more in secondary.