Ingredients

For the pastry

• 350g/12oz plain flour, plus extra for dusting
• 115g/4oz icing sugar, sifted
• pinch salt
• 225g/8oz cold unsalted butter, cut into cubes
• 1 free-range egg, plus 2 egg yolks, lightly beaten

For the filling

• 6 egg yolks
• 90g/3¼oz caster sugar
• 40g/1½oz cornflour
• 450ml/16fl oz full-fat milk
• 2 vanilla pods, split lengthwise
• 50ml/2fl oz double cream
• 45g/1½oz unsalted butter, cut into small pieces
• 1-2 tbsp elderflower cordial, preferably homemade
• 400g/14oz mixed berries, such as redcurrants, blueberries, raspberries and strawberries
• 170g/6oz redcurrant jelly, to glaze