Β½ tsp bicarbonate of soda
200g/7oz caster sugar
50g/2oz cocoa powder, sifted
150²µ/5Β½΄Η³ϊ ground almonds or 125g/4Β½oz plain flour (a gluten-free if required or on a low-FODMAP diet)
150ml/5fl oz regular olive oil, plus extra for greasing
pinch salt
2 tsp vanilla extract
3 free-range eggs