• Place the flour, baking powder, baking soda and salt in a mixing bowl and whisk until all the ingredients are combined.
• Beat the butter, sugar and lemon zest until light and fluffy.
• Add the eggs to the butter mixture one at a time. Making sure to scrape down the side of the bowl every now and then. 
• In a separate bowl, combine the buttermilk, lemon juice and vanilla essence. 
• While the mixer is running on medium speed add the flour mixture to the butter, alternating with the lemon juice mixture.
• Mix until just combined, do not overmix the batter.
• Pour the batter into the prepared bundt cake tin and pop it into the oven.
• Bake for 45-50 minutes or until a fork inserted comes out clean.
• Allow cake to cool completely before removing the cake from the tin.

For the lemony glaze:

• Whisk all the ingredients together, adding more powdered sugar if need.
• Pour over cooled cake and devour!