1kg/2lb 4oz plums, halved, stones removed
500g/1lb 2oz plain flour, plus extra for dusting
100²µ/3Β½΄Η³ϊ caster sugar
100²µ/3Β½΄Η³ϊ ground almonds
100²µ/3Β½΄Η³ϊ icing sugar
200g/7oz sugar
250g/9oz butter, cubed
100²µ/3Β½΄Η³ϊ unsalted butter, softened
1 free-range egg
1 free-range egg yolk