Step 1

Grease a 13X18-inch jelly roll pan and preheat the oven to 350°F.

Step 2

In a large bowl whisk together flour, baking soda, salt, sugar, sour cream, lemon extract and eggs. Stir until completely combined.

Step 3

Place butter, water, lemon rind, lemon juice in a medium sauce pan. Bring to a boil, stirring occasionally.

Step 4

Add the hot butter mixture to the flour mixture and stir well. Pour into the prepared jelly roll pan.

Step 5

Bake at 350°F for 17-20 minutes or until it tests done. Cool on a wire rack for 20 minutes while you make the icing.

Step 6

Combine the butter, and milk in a sauce pan. Heat over medium heat until the butter is melted and the mixture just starts to boil. Remove from heat and stir in the lemon extract.

Step 7

Gradually add the powdered sugar, stirring the mixture until it reaches a good consistency for spreading.

Step 8

After the cake has cooled for 20 minutes, spread the warm icing on the cake. Let cool completely on a wire rack.