Ingredients:
- ¾ cup softened unsalted butter, plus more for greasing pan
- 1½ lbs. fresh blackberries (about 6 cups)
- 1 tbsp. dark brown sugar
- 3 granny smith apples, cored, peeled, and quartered
- ⅓ cup apple brandy, such as calvados
- 2½ cups cake flour
- 2¼ tsp. baking powder
- 1 tsp. ground cinnamon
- ½ tsp. fine salt
- ¾ cup milk
- 1½ tsp. vanilla extract
- Zest of 1 lemon
- 1 cup plus 2 tbsp. superfine sugar
- 4 eggs
- Crème fraîche, for garnish (optional)