Carefully stir in the flour, cacao powder, vanilla powder, bicarbonate of soda, cream of tartar, sea salt
Take two 8" sandwich tins, (I use the tins with the release bottoms, much easier for turning out).coat in a small amount of olive oil and sprinkle with coconut flour ensuring it's well distributed to ensure that the cake releases easily.
Divide the mixture between the tins and give them a gentle bang on the worktop to ensure the mixture is flat on top for stacking.
Put in the oven at 180 degrees for 30-35 minutes
Allow to cool slightly before transferring to a cake rack.
For the buttercream, whisk all the ingredients together and when the cake is cool spread evenly over the middle and then cover the cake.
Recipe by The Life Sutra at https://thelifesutra.com/paleo-chocolate-celebration-cake/