5 tsp baking powder
80g/3oz caster sugar
500g/1lb 1oz strong white flour, plus a little extra for rolling out
80g/3oz softened butter, plus a little extra to grease the baking tray
butter
clotted cream
2 free-range eggs
1 free-range egg, beaten with a little salt (for glazing)
250ml/8陆fl oz milk
good-quality strawberry or raspberry jam