3 limes, juice and zest
90²µ/3¼´Ç³ú plain flour
100²µ/3½´Ç³ú caster sugar
120²µ/4¼´Ç³ú caster sugar
60²µ/2¼´Ç³ú cocoa powder, plus an extra 2–3 tbsp for dusting
pinch fine sea salt
25g/1oz cold unsalted butter, cut into small cubes
150g/5½oz unsalted butter, softened, plus extra for greasing
vanilla ice cream or cream, to serve
1 large free-range egg, lightly whisked
2 large free-range eggs, lightly beaten
100ml/3½fl oz full-fat milk
3 tbsp cold espresso coffee