Blackberry cake recipe

Ingredients

• 220 g plain flour, plus more for dusting
• 200 g granulated sugar
• 2 tsp baking powder
• 0.2 tsp baking soda
• 0.2 tsp salt
• 3 eggs
• 180 ml sour cream
• 1 tsp vanilla extract
• 1 tbsp brandy
• 1 lemon (zest only)
• 420 g blackberries
• 1 tbsp unsalted butter (for greasing tin)