Preheat oven to 175°C (350°F) and grease a 9-inch cake tin.
Whisk together the almond flour, baking powder and baking soda.
In a separate bowl, whisk olive oil, honey, eggs, vanilla, lemon zest and lemon juice.
Fold the dry ingredients into the wet until just combined.
Pour into the tin and bake for 25–30 minutes, or until a skewer comes out clean.
Cool completely, dust with icing sugar if using, then slice and enjoy.
