Blueberry Custard Cake

Bahan-bahan (12 porsi)

• 1 1/2 cups milk (, full fat)
• 1 tsp vanilla bean paste ((or extract))
• 1/3 cup superfine/caster sugar ((Note 1))
• 1/4 cup / 60 g egg yolks (~4 large eggs) ( (Note 2))
• 3 1/2 tbsp cornflour / cornstarch
• 30 g / 2 tbsp unsalted butter (, cold, cut into 1 cm / 1/2" cubes)
• 1/2 cup superfine/caster sugar ((Note 1))
• 1/4 cup canola oil ((or other neutral oil))
• 1 large egg ((Note 3))
• 1/2 cup plain yogurt ((Note 4))
• 1/2 tsp vanilla extract
• 2 tsp lemon zest (, finely grated (1 large lemon))
• 1 cup flour (, plain / all-purpose)
• 2 tsp baking powder
• Pinch of salt
• 250 g / 8 oz blueberries (, fresh or frozen (do not thaw))