Preheat the oven to 160 degrees C
Line a loaf tin with parchment paper
In a medium mixing bowl add in the dry ingredients of almond meal, buckwheat flour, baking powder and salt, mix well to combine
In a small bowl whisk together the eggs, castor sugar and olive oil until well combined
Pour the wet ingredients into the dry and mix well to combine.
Add in the zest of a lemon and then the juice of the lemon
Mix until well combined
Pour the mixture into the prepared loaf tin and place in the oven to bake for approximately 55mins to 1 hour or until a skewer comes out clean.
Remove from the oven and let cool in the tin for 10 minutes and turn out onto a wire rack for a further 10-15mins to cool.