plain flour, for dusting
1 tsp almond extract
100g/3½oz caster sugar
50g/1¾oz flaked almonds
100g/3½oz ground almonds
100g/3½oz unsalted butter, softened
1 free-range egg, beaten, to glaze
1 large free-range egg, plus 1 yolk, at room temperature
750g/1lb 10oz ready-made all-butter puff pastry, chilled