Method

• Make chocolate ganache by putting cream into a medium saucepan over low heat. Bring to a gentle simmer and remove from heat. Stir in chocolate and set aside for 10 minutes, then stir again until a silky-smooth chocolate mixture forms. Set aside at room temperature.
• Make chocolate custard by putting egg yolks, cornflour, vanilla, half of the sugar and 1 Tbsp of the milk in a large bowl. Whisk until smooth.
• Heat milk, chocolate and remaining sugar in a medium saucepan over low heat, stirring until chocolate has melted. Remove from heat, gradually pour over the egg mixture, whisking constantly, until smooth. Return mixture to saucepan, increase heat to medium-low and cook, stirring constantly with a whisk, for about 5 minutes or until mixture becomes very thick and smooth.
• Transfer to a bowl and press a piece of plastic wrap directly onto surface to prevent a skin from forming. Refrigerate for 15 minutes or until cold.
• Add cream to chilled custard mixture and beat with electric hand beaters until combined and smooth.
• Spoon chilled custard into a piping bag fitted with a narrow (about 5mm) nozzle. Insert the nozzle into the profiterole shell and gently pipe until profiteroles are full.
• Drizzle with ganache, sprinkle with pecans and hazelnuts, and serve.