Preheat the oven to 160c fan
grease and line three shallow 7 or 8 inch baking tins
Peel and finely grate the beetroot, i do this is a food processor with the fine grater attachment, (to save my hands from turning pink) if you don't have a food processor you might want to wear gloves, i hold the beetroot with a cloth while i peel them also.
Weigh out 150g of the grated beetroot in a bowl, there was about 1 tbsp of the juice from grating them in the food processor, unlike other veg cakes, where i strain any liquid away i kept the juice for this one.Grate the lemon and clementine zest into the bowl with the beetroot and add the juice (juice from half the lemon and juice from the whole clementine) , then peel the skin off the stem ginger and grate into the same bowl. Mix together and let sit. Whisk the oil and sugar together for a few minutes until pale and creamy, then add the eggs one at a time while whisking at high speed until the mixture is thick and pale.
In a bowl mix together the flour, baking powder, dried spices and a pinch of salt, add the ground roasted hazelnuts then add into the bowl with the oil/eggs and fold in with a spatula.
Finally fold in the beetroot mixture.
Pour the batter evenly between the three tins then bake on the middle shelf for 20 to 22 minutes. (After 10 minutes i moved the tins around to make sure they baked evenly) to check the cakes are baked, insert a knife into the centre and it should come out clean.
Once baked leave the cakes to cool in the tins for 15 minutes, then carefully peel the paper off and place them on a cooling rack until completely cool. (if not assembling right away then wrap in plastic wrap until needed to keep fresh)