Puree the cucumber, avocado and herbs in a food processor or blender until a homogeneous texture is achieved. Stir in the yoghurt and lemon juice, season the soup. Cover and refrigerate for approx. 1 hr.
Halve the dough lengthwise, cut each into 6 strips of equal width, brush with the tapenade and grate the parmesan on top. Hold the strips at both ends, twist carefully and place on a baking tray lined with baking paper.
Bake for 15-20 mins. in the centre of an oven preheated to 180°C.