9–12 tsp chocolate hazelnut spread, such as Nutella
100²µ/3½´Ç³ú caster sugar
handful toasted hazelnuts, roughly chopped
50²µ/1¾´Ç³ú icing sugar
½ tsp flaky sea salt
2 tbsp chocolate curls
100²µ/3½´Ç³ú unsalted butter, melted
7 large sheets filo pastry
200g/7oz mascarpone
150²µ/5½´Ç³ú ricotta