Put together the filling close to serving time as the avocado can turn brownish despite the lemon juice.
Peel 6 hard-boiled eggs and carefully cut them in half.
Remove the yolks and place them in the bowl of a small food processor or a deep bowl if using an immersion blender (my choice). It’s not a large amount, so a regular blender or large processor tend to be too big. You can also mash the ingredients with a fork and then use an electric mixer to cream them.
Add 1 Haas avocado, cut into pieces, ¼ teaspoon salt, ¼ teaspoon black pepper, 1 teaspoon mayonnaise, 1 tablespoon lemon or lime juice and a pinch of paprika or cayenne pepper if using.
Blend or process until smooth. Add a little water, half a teaspoon at a time, if needed for consistency. Be careful not to make it too fluid as you need the filling to hold up.
Transfer the avocado mixture to a piping bag with a star tip or use a teaspoon.
Fill the egg whites with the avocado cream. Serve immediately, as the avocado may darken over time despite the lemon juice.
Garnish with extra black pepper, and fresh dill, parsley, cilantro or chopped chives before serving.