In a bowl, add sugar, unsalted butter and beat it using a hand mixer until you combine everything properly.
Add eggs to the bowl and beat it again using the hand mixer.
Add buttermilk, vanilla essence, lemon zest and flour to the bowl and mix everything using a spatula. Then use the hand mixer to mix everything again.
Mix lime juice, baking powder and salt to the cake batter. Mix everything using hand mixer and then use a spatula to scrape the sides so that everything is mixed properly.
Transfer the batter to the cake pan and spread it evenly. Bake at 180oC for 55 to 60 minutes.
After baking let the cake cool completely.
for icing
Take powdered sugar and add lime juice.
Add the glaze to the cake and garnish with lemon slices. Serve and enjoy.