100驳/3陆辞锄 blueberries
1 lemon, zest only
12 tsp lemon curd
1 tsp bicarbonate of soda
100驳/3陆辞锄 golden caster sugar, plus 2 tsp for sprinkling
250g/9oz self-raising flour
100g/4oz butter
2 free-range eggs
2 tbsp milk
150ml/5fl oz low-fat natural yogurt