Slice the eggs in half lengthwise and place on a platter. Remove the yolks and set aside.
In a medium bowl, add avocado, lime, cilantro, egg yolks from 3 whole yolks (discard the remaining yolks), salt and pepper to taste and optional cayenne pepper. Mash with a fork until smooth.
Optional: If using a piping bag and tip to fill the eggs, place the ingredients in a small food processor and pulse until smooth. This gives a smoother consistency and breaks down the cilantro better, which will avoid clogging the piping tip when adding the filling. Skip this step if you are simply spooning in the filling.
If piping the filling into the eggs, spoon the mixture into a piping bag fitted with a large star tip. Fill each egg with avocado filling.
Garnish with 2 cilantro leaves and 2-3 diced tomato pieces to resemble Christmas Holly.
Refrigerate eggs until ready to serve.
Notes
This recipe should be prepared the same day as serving. The lime helps the avocado to keep its green color for several hours.