75²µ/2½´Ç³ú caster sugar
50²µ/1¾´Ç³ú cocoa powder, sieved
25g/1oz cornflour
2 tsp extra-virgin olive oil
½ tsp smoked sea salt flakes (see tip section)
¾ tsp smoked sea salt flakes
1 tsp vanilla paste or extract
2 x 154g/5½oz packets chocolate cookies, such as Oreos or Bourbons(28 small biscuits in all)
50²µ/1¾´Ç³ú dark chocolate (min. 70% cocoa solids)
100²µ/3½´Ç³ú dark chocolate (minimum 70% cocoa solids)
50²µ/1¾´Ç³ú unsalted butter, softened
500ml/18fl oz double cream
4 tbsp full-fat milk
2 tsp instant espresso powder or strong instant coffee powder