½ lemon, zest and juice
1kg/2lb 4oz red plums, quartered if large, halved if small, stones removed
150²µ/5½´Ç³ú plain flour
1 tsp baking powder
2 tbsp sugar
3 tbsp sugar
100²µ/3½´Ç³ú amaretti biscuits (crunchy, not morbidi)
30g/1oz unsalted butter
100²µ/3½´Ç³ú cold unsalted butter, cut into small dice