250g/9oz peeled cooked beetroot, roughly chopped
4 tbsp plain flour
200g/7oz light brown sugar
2 tbsp cocoa powder
100驳/3陆辞锄 ground almonds
pinch salt
200g/7oz dark chocolate (minimum 70% cocoa solids), broken into squares
200g/7oz unsalted butter, cubed, plus more for greasing
3 free-range eggs