Chocolate Chestnut Torte -Torta di cioccolato e castagne

Torte

• plain flour, for dusting
• 280 g dark chocolate (70% cocoa solids), small pieces or callets
• 450 g chestnut purée (see tip)
• 6 egg yolks, from large eggs
• 100 g unsalted butter, soft, plus extra for greasing
• 4 Tbsp dark rum
• 60 g caster sugar
• 6 egg whites, from large eggs
• ¼ tsp fine sea salt

Glaze

• 170 g dark chocolate (70% cocoa solids), small pieces or callets
• 100 g double cream
• 1 Tbsp dark rum