Cream together sugar, lemon zest, and room temperature butter
Beat in room temperature eggs one at a time
Add lemon extract to the mixture
In a separate bowl, whisk together cake flour, baking powder, and fine salt
Alternate adding dry ingredients and milk to the wet ingredients, beginning and ending with dry ingredients
Pour batter into a sheet cake pan
Bake according to temperature and time (not specified in provided text)
Allow cake to cool
Prepare glaze by whisking together powdered sugar, lemon extract to taste, and warm water until smooth
Pour glaze over cooled cake
Top with extra lemon zest
