In a food processor, combine the avocado, lemon juice, salt and pepper.
While the processor is blending, slowly pour in the olive oil.
Transfer mayo to a bowl and stir in chopped chives. Refrigerate for about 15 minutes.
Place a thin layer of salmon on a slice of cucumber. Spread some avocado mixture on top an roll.
Garnish by placing two chive stems in the middle of the roll. Enjoy!