150g/5½oz fresh blackberries
10g/â…“oz mixed dried cep (porcini) mushroom powder
20²µ/¾´Ç³ú cornflour
62.5g/2¼oz caster sugar
90g/3¼oz caster sugar, plus extra to line
200g/7oz good quality white chocolate
butter, at room temperature, to grease
140g/5oz egg whites
60²µ/2¼´Ç³ú egg yolks
250ml/9fl oz full-fat milk
300g/10½oz cep ²õ´Ç³Ü´Ú´Ú±ôé base (see above)