In the bowl of your stand mixer cream butter and sugar together.
Add sour cream to the butter mixture and combine thoroughly.
In a small bowl mix together flour, salt, and baking soda.
Slowly add the flour to the sour cream mixture adding ½ cup at a time alternating it with the eggs until all of the flour and eggs have been incorporated.
Add vanilla, lemon extract and lemon zest.
Prepare a loaf pan by greasing and flouring it and lining it with a piece of parchment paper cut to fit the bottom.
Pour the mixture into the prepared loaf pan and bake for 40 minute - 1 hour or until a toothpick inserted into the center of the cake comes out clean.
Let cake cool completely on a cooling rack then spread or drizzle the icing over the cake and place it in the refrigerator to firm up.