
A variation on this is to use 50/50 apple and rhubarb. 125g self-raising and no ground almonds, swap the almond extract for vanilla. Also add a 1/4-1/2 tsp of ground ginger.
9-inch/23cm springform or regular cake pan
Preheat the oven to 160°C fan and set an oven rack in the middle position. Grease the cake pan with butter or nonstick cooking spray.
In a bowl, beat the butter and sugar together until light and fluffy
Add the eggs, one at a time, beating well and scraping down the sides of the bowl after each addition. Beat in the almond extract and rum. Don't worry if the batter looks curdled at this point; that's okay.
Fold in the flour, ground almonds and baking powder and mix until just combined
Add the apples and mix until just combined
Pour the batter into the prepared pan and spread evenly
Bake for about 40 minutes, or until the cake is golden and a toothpick inserted into the center comes out clean.