Kue Remah Blueberry yang Meledak

Bahan-bahan (12 porsi)

• 2/3 cups flour (, plain/all-purpose)
• ½ cup caster sugar ((superfine sugar))
• 1/2 tsp cinnamon powder
• 1/8 tsp cooking/kosher salt
• 60 g / 4 tbsp melted butter
• 1/4 tsp vanilla extract
• 1 1/3 cups flour (, plain/all-purpose)
• 2 tsp baking powder
• 1/4 tsp cooking/kosher salt
• 3/4 cup caster sugar ((superfine sugar))
• 1 tsp vanilla extract
• 1 tbsp lemon zest
• 2 large eggs
• 90 g / 6 tbsp unsalted butter (, melted then cooled slightly (don’t use piping hot))
• 1/3 cup sour cream (, at room temperature (sub plain yogurt))
• 1/3 cup milk (, at room temperature (full fat best, low fat ok))
• 500 g / 1 lb fresh blueberries ((Note 1 for frozen))
• 2 tsp lemon juice
• 2 tbsp caster sugar ((superfine sugar))
• 3 tbsp flour (, plain/all-purpose)