Step 1

Heat the oven to 200C/180C fan/gas Blitz 50g of the hazelnuts in a small food processor until they resemble fine breadcrumbs, then tip into a bowl with the chocolate.

Step 2

Roll the pastry out to a round roughly 30cm in diameter on a sheet of baking parchment. Scatter the chocolate and hazelnut mixture over the pastry circle, leaving a 5cm border. Top with the bananas and most of the remaining hazelnuts, then fold the edges of the pastry over. Transfer the galette to a baking sheet along with the baking parchment, then chill in the fridge for at least 10 mins.

Step 3

Remove from the fridge and sprinkle the sugar over the galette, then bake for 25-30 mins, or until golden and puffed up. Scatter over the remaining hazelnuts and serve with a scoop of vanilla ice cream, if you like.