My mum made this cake with rhubarb for her bridge group a couple of weeks ago. I arrived to visit just in time to nibble the last delicious bits, topped with some Greek yoghurt. If you don’t have buttermilk, add a tablespoon of lemon juice to a cup of milk for the same result. Here I have served it with whipped cream and added berries.
Preheat an oven to 180C. Line a 22cm tin with baking paper.
Cream the butter, sugar, egg and vanilla until pale. Sift in the flours and cinnamon.
Add the buttermilk or yoghurt and stir through. Pour the batter into the tin. Sprinkle over the rhubarb and berries.
For the topping, combine butter, cinnamon and sugar in a small bowl. Dot mixture over the rhubarb. Place into the oven for 45 minutes or until a skewer comes out clean.