Preheat the oven to 200C/180C Fan/Gas 5. Line an 8" square tin.
In a large bowl/the bowl of a stand mixer, beat together the butter and sugar for about 3-5 minutes, until light and fluffy.
Add the eggs and almond extract and combine again. Then, add the flour, baking powder and ground almonds and gently fold to combine. Add the milk to loosen, stir gently.
Pour the batter into the lined tin and bake for 25 minutes, until golden and a skewer inserted comes out clean. Let cool on a wire rack before icing.
Make the icing in a small bowl by combing the icing sugar, milk and almond extract. It should be thick, but pourable. Adjust if necessary.
Optional: Remove about 2 tbsp of the icing into another bowl/mug, and add some pink food colouring to this small batch.
Pour the white icing over the cake and spread to cover. Add the pink in horizontal lines, about 3cm apart. Use a skewer/toothpick/knife to create the feather effect: do this by gently dragging the tool through the lines of pink icing (moving vertically through the horizontal lines), so that you are 'dragging' the pink.
Dollop on some of the cherry jam randomly and move the skewer through these to create swirls! Slice and serve.