200g/7oz (or 1 punnet) blueberries
1 lemon, finely grated zest and a squeeze of the juice
115g/4oz icing sugar, plus extra for dusting
25g/1oz icing sugar
1 vanilla pod, seeds only (or alternatively 2 drops of vanilla extract)
250g/9oz shop-bought puff pastry
165ml/5Β½fl oz whipping cream