Heat the oven to 190°C/170°C fan/gas 5. Spread 7-8 tbsp Nutella onto a 320g sheet of ready-rolled puff pastry. Tightly roll into a long log, then slice into 12 even pieces. Put the pieces onto a baking sheet lined with non-stick baking paper, then bake for 18-20 minutes until golden.
Blend 250g vanilla ice cream with 3 tbsp Nutella and 100ml whole milk until smooth.