Sour Cream Blueberry Cake

Ingredients

• 3 cups all-purpose flour
• 1 tbsp baking powder
• 1/2 tsp salt
• 6 tbsp (3 oz./90g) unsalted butter, at room temperature
• 1 1/3 cups granulated sugar
• 2 large eggs
• 2 tsp vanilla extract
• 1 tsp grated lemon zest
• 1/4 cup sour cream
• 3/4 cup milk
• 2 cups blueberries, fresh or frozen
• 1/4 cup unsalted butter
• 1 tbsp fresh lemon juice
• 1/2 cup sifted icing sugar
• 1/2 tsp grated lemon zest