Preheat the oven to 180°C.
Prepare a round cake tin (20 cm) – line the base with baking paper and secure the ring.
Wash and chop the rhubarb into small pieces.
In a medium bowl, mix the dry ingredients (except for the sugar): both flour, baking powder, and baking soda.
In a stand mixer or using a hand mixer, beat the eggs until light and fluffy (about 6–8 minutes). Gradually add the sugar, one tablespoon at a time, while continuing to beat (about 2 minutes). Slowly drizzle in the oil in a thin stream while mixing. Then add the yoghurt.
Reduce the mixer speed and add the dry ingredients – mix briefly, just until combined.
Pour the batter into the prepared tin, then distribute the rhubarb on top, gently pressing it into the mixture. Sprinkle with flaked almonds and almond sugar.
Bake for 40–45 minutes, or until a skewer inserted in the centre comes out clean. Enjoy!