Cut avocado in half lengthwise.Remove seed from avocado.Peel skin away from avocado fruit.Place avocado halves flat and cut 2-3mm slices across from end to end.Fan out avocado slices into a straight line.Curl the line of avocado slices into a spiral until avocado rose takes shape.Douse the avocado flowers with juice of lemon or lime.Add salt and pepper to taste.