Preheat the oven to 180°C (fan)/200°C/gas mark 6.
Lightly grease your doughnut moulds (you'll need enough for 12 doughnuts). If using silicone ones place them on a baking tray as they can be hard to move when full.
Make your flax eggs by mixing 2 tablespoons ground flax seeds with 6 tablespoons water. Stir and set aside to thicken.
Sift together 180g spelt flour, 1 teaspoon bicarbonate of soda and 1 teaspoon ground cinnamon and mix
In a separate bowl mix together the 3 tablespoons sunflower oil, a teaspoon of vanilla extract, your 2 flax eggs, 100ml maple syrup and 1 tablespoon cider vinegar.
Using a metal spoon fold the dry ingredients into the wet ingredients.
Finally gently stir in 200g grated beetroot.
Spoon the mixture into the doughnut moulds. You'll only need to half fill them as they rise while cooking.
Bake for 12-15 minutes until firm to the touch.
Remove from the oven and allow to cool in the moulds for a few minutes before carefully turning out onto a wire rack. Allow to cool completely.
If icing, sift together 80g icing sugar and 1 teaspoon beetroot powder (optional) then gradually stir in a tablespoon water until you have a thick paste. Transfer to a piping bag to decorate your doughnuts or drizzle over with a spoon.
Allow to set for a few moments before serving.
Store in an airtight container.