300²µ/10Β½΄Η³ϊ plain flour
18²µ/ΒΎ΄Η³ϊ baking powder
25g/1oz caster sugar
pinch fine salt
85g/3oz unsalted butter or vegan block butter, cut into 1cm cubes
1 free-range egg yolk whisked with a pinch each salt and sugar
175g/6oz full-fat milk, or plant milk