Step 1

To make the cookie dough sieve the flours, cocoa powder and baking soda into a large bowl, pushing any lumps of cocoa powder through the sieve. I avoid sieving unless necessary and this is one of those time. Cocoa powder often forms little lumps so it’s always important to sieve it unless you want little dry pockets throughout your recipe. Add the salt and whisk everything together.

Step 2

Place the butter and sugars into the bowl of an electric stand mixer, fitted with the paddle attachment, and on medium speed beat tother for about 2-3 minutes just until smooth and creamy (you can do this with an electric hand mixer too if you want). We don’t want to beat lots of air into the butter we just want to make it soft enough that the flour mixture combines easily so don’t overdo it at this stage. Add the vanilla and mix briefly to combine.

Step 3

Turn the mixer off and pour in the flour mixture. We don’t want to make a huge mess and have a cloud of flour and cocoa powder cover every surface in your kitchen so cover the bowl of the mixer with a kitchen towel and then gently pulse the mixer on and off just to get the flour combined a little before turning the mixer to low to mix it in properly. We want to mix in the flour just until it disappears into the butter but before the mixture forms a ball of dough, it should still look a little crumbly.

Step 4

Add the chunks of caramelised white chocolate and mix briefly just to distribute. Tip the dough out onto the worksurface and use your hands to briefly bring together as a uniform dough. Cut the dough into two roughly equally sized pieces and set one aside for the moment. Form each ball of dough into a log that is roughly ??cm thick. Roll the log of dough in parchment or clingfilm and refrigerate until firm, about 3-4 hours. Repeat with the second piece of dough.

Step 5

When ready to bake preheat the oven to 160ºC (140ºC Fan) 325ºF and line a couple baking trays with parchment paper. Unwrap one of the logs of dough and use a sharp knife to cut into slices about 1/2 an inch, just over a cm, thick. Place them onto the prepared baking trays leaving just a little space between. The cookies will spread but not significantly. Sprinkle each with a little extra flaked sea salt, unless you are one of those people that have sent me angry emails about your hatred of salt being sprinkled onto cookies you guys can leave it off and stop emailing me. Bake in the preheated oven for 14 minutes. The cookies wont look done, they’ll be incredibly dark so you cant use visual clues and if you press them they’ll feel too soft but trust the process, as the cookies cool they crisp up leaving you with a wonderful sable texture. Sable is French for sand and these cookies should have a slightly crumbly, almost shortbread like texture.

Step 6

Kept in a sealed container these cookies will keep for about 4-5 days.