500g/1lb 2oz rhubarb, cut into 2.5cm/1in pieces
200g/7oz strawberries, hulled and sliced
240²µ/8½´Ç³ú plain flour, plus extra for dusting
75²µ/2½´Ç³ú caster sugar, plus extra for sprinkling
2–3 tbsp caster sugar, to taste
2 tsp icing sugar, to decorate (optional)
pinch of salt
115g/4oz butter, chilled and cut into cubes
1 large free-range egg, plus 1 small beaten egg for brushing