Clean rhubarb and cut each stalk into small chunks.
Prepare your cake tin by greasing it slightly and lining the bottom with greaseproof paper.
Preheat the oven to 180C(Fan)/350F/Gas Mark 4.
In a large bowl whisk together flour, sugar, baking powder and baking soda and set aside.
In a medium jug whisk together soya milk, apple cider vinegar, vanilla extract and oil until well combined.
Next, pour the liquid mixture into the bowl with dry ingredients and mix it in gently until incorporated. Don't overmix!
Pour cake batter into prepared tin, spread rhubarb chunks evenly over the top pressing them down gently and sprinkle generously with ground cinnamon.
Bake for approximately 45-50 minutes or until the toothpick inserted in the centre of the cake comes out clean.
Let the cake cool and sprinkle it generously with icing sugar.
Serve and enjoy!