Pre-heat the oven to 160°C/fan 140c. Grease and line a 20cm square baking tin with parchment paper.
2
Place all the dry ingredients in a large bowl and make a well with the back of a spoon. Add the eggs, butter, milk and zest and beat with a hand mixer until well combined for about two minutes.
3
Pour the mixture into the lined tin, place in the oven on the middle rack and cook for 35-40 minutes until golden brown on top and risen. Turn out onto a wire rack and allow to cool completely before icing.
4
Whisk together the icing sugar and lemon zest with enough of the juice to make a thick drizzle and spread over the top of the cooled lemon cake. Allow to set then slice into rectangular pieces.