½ unwaxed lemon, finely grated zest and juice
½ lemon, juice only
½ orange, finely grated zest and juice
150²µ/5½´Ç³ú plain flour, plus extra for dusting
2 tsp baking powder
½ tsp bicarbonate of soda
½ tsp ground cardamom or cinnamon
225g/8oz golden caster sugar
100²µ/3½´Ç³ú ground almonds
150–175²µ/5½–6´Ç³ú icing sugar
100²µ/3½´Ç³ú ground pistachios
25g/1oz nibbed pistachios (see tip)
2 tsp rosewater or orange blossom water
a few drops rosewater
200g/7oz unsalted butter, softened, plus extra melted for greasing
4 free-range eggs, beaten
3 tbsp soured cream or natural yoghurt
1 tbsp orange juice