Pre-heat the oven to 160C/325C/Gas mark 4.
Grease and line a 23cm spring-form cake tin and grease again.
Tip in the 3tbsp of caster sugar and swirl inside the tin to coat the side and bottom.
Arrange the apples around the bottom of the tin along with a third of the berries.
Cream the butter and sugar together, then gradually beat in the eggs. Sift the flour with the ginger and gently fold into the mixture.
Carefully stir in the milk followed by the remaining blackberries.
Spoon the batter into the tin over the fruit.
Bake for 40 minutes, until the sponge is springy and golden and a skewer comes out clean.
Serve either warm or cold.
Our thanks to the National Trust for permission to use this recipe.
Try one of our other apple recipes, including more delicious apple cake recipes and ideas for apple-based desserts