1 Preheat the oven to 180¼C/gas mark 4. Grease the cake tin and line the base with baking parchment.
2 Prepare the shortbread base first. In a food processor, pulse together the flour, butter, icing sugar and salt until the butter has been rubbed into the flour. Tip into the prepared tin and press into an even layer covering the base. If your jam is a tad chunky, give it a quick whizz in the food processor to break up any large bits.
3 Bake the shortbread on the middle shelf of the oven for 12 minutes until pale golden. Leave to cool in the tin on a wire rack.
Place the dry ingredients for the crumble topping in a bowl and stir in the melted butter with your fingertips until the mixture starts to clump together.
4 Now for the cake. Cream the butter and sugar until really pale and light. Gradually add the beaten eggs, mixing well between each addition and scraping down the sides of the bowl with a rubber spatula from time to time. Add the lemon zest, vanilla and almond extract and mix again. Sift in the dry ingredients and beat until smooth, then add the soured cream and mix again.
5 Spread the jam evenly over the shortbread, but leaving a 1cm border around the edge, otherwise it will burn on the sides of the tin. Spoon over the cake mixture and spread level, arrange the cherries on top and scatter with the crumble. Bake on the middle shelf of the oven for 45 minutes–1 hour until golden brown, well risen and a skewer inserted into the middle comes out clean.
6 Loosely cover the top with baking parchment if it appears to be browning too quickly.
7 Leave the cake to cool in the tin for 10 minutes, then run a palette knife around the edge to loosen the sides, remove from the tin and cool completely on a wire rack.
Summer Berries and Autumn Fruit by Annie Rigg. Published by Kyle Books, priced £19.99.
Photography by Tara Fisher.