150g/5oz fresh blueberries
175g/6oz rice flour
50g/2oz tapioca flour
2 tsp gluten-free baking powder
1 tsp bicarbonate of soda
150g/5oz caster sugar
录 tsp salt
60驳/2陆辞锄 butter, melted and cooled
60驳/2陆辞锄 buttermilk
1 egg, preferably free-range, beaten
2 tbsp milk