Heat the oven to 180°C (fan) and line a baking tray with baking paper. Roll out the dough on a clean work surface.
Place the dates in a food processor with the vanilla, 1 tablespoon of water, and a pinch of salt. Blend until smooth, adding a little more water if necessary to turn it into a spreadable paste.
Spread the dates mixture evenly over the dough, leaving a 2cm border around the edges. Sprinkle over half the chopped nuts.
Starting from the short edge closest to you, roll the dough tightly to form a roll. Cut the ends, then cut into 8 equal spirals. Place on the prepared tray, leaving a gap between them.
Bake for 18–20 minutes, or until risen and golden. Leave to cool slightly.
Heat the light chocolate butter, then drizzle over the spirals and finish with the remaining chopped nuts, and a light dusting of icing sugar.
