Scone dough
340g/120z plain flour
1tsp baking soda
pinch salt
50g/ 2oz caster sugar
80g/30z butter
1 egg
175ml/l6fl oz buttermilk
Filling
700g/1lb rhubarb, roughly chopped
200-250g/7-9oz sugar
white of 1 egg, whisked
caster sugar to dust
Preheat oven to gas mark 4, 180°C, 350°F, and grease a...