Avocado with smoked salmon is nearly banal (but theoretically it should be forbidden, fat+fat :-)), then lemon makes it all lighter.
But the twist is the wild fennel, which makes it interesting.
Well, wild fennel I collect every morning on my running path. It is convenient living in the Umbrian countryside!
Another twist is the wine: The Trebbiano Spoletino is wonderful. Its tropical fruit aromas contribute still more complexity to this dish.