Place the sugar and lemon zest into a bowl and rub together to coat the zest thoroughly with sugar and draw out the oils in the peel.
Add the eggs and beat until pale and fluffy and a ribbon has formed, approximately 3 minutes with a hand mixer.
Add in the lemon juice and beat for 1 minute, until well combined.
Place the flours, baking powder, baking soda and salt in a separate bowl and stir until combined.
Add to the sugar and lemon mixture and beat on low until just combined and no dry portions remain on the sides of bowl.
In a slow and steady stream, pour in the olive oil until fully combined.
Pour the batter into your prepared pan.
Top with the honey crumb mixture and press it down lightly to hold into the top of the cake.
Bake for 55 minutes or until a skewer comes out of the center of the cake clean and doesn’t feel oily when you rub the skewer between your fingers.
Remove and allow to cool.
Sprinkle confectioner’s or icing sugar over the top.
Slice and serve.