You'll find yourself reaching for this recipe over and over again.

  1. Preheat the oven to 160°C/320°F/Gas Mark 3. 
  2. Line the base of a 33 x 23 x 5cm (13x 9 x 2 inch) cake tin, or a 25.5cm (10 inch) sauté pan or cast-iron frying pan with parchment paper, allowing it to hang over the sides. Arrange 6–8 sweet geranium leaves over the base – these give the sponge a haunting lemony flavour. 
  3. To make the sponge base, combine the butter, sugar and flour in the bowl of a food processor. Whizz for a second or two, then add the eggs and stop as soon as the mixture comes together. Spoon the mixture over the base of the tin as evenly as possible (over the sweet geranium leaves). 
  4. Peel the apples. Cut into thin slices and arrange on top of the sponge in three lines. Arrange a line of blackberries in between each row. Sprinkle 25g (1oz) of the caster sugar over the top and bake for about 50 minutes. 
  5. Meanwhile, whizz 2–4 sweet geranium leaves with the remaining 50g (2oz) caster sugar in a food processor. Spread over a baking tray and set aside at room temperature to dry out. 
  6. Once it is fully cooked, the centre of the cake should be firm to the touch and the edges slightly shrunk from the sides of the tin.
  7. Serve in the tin, sprinkled with the sweet geranium sugar. Alternatively, leave to rest in the tin for 4–5 minutes before turning out. Serve with crème fraîche or softly whipped cream. 

Taken from One Pot Feeds All by Darina Allen, published by Kyle Books.