2 cups all purpose flour
1½ cups granulated sugar
1 tbsp baking powder
½ tsp salt
½ cup vegetable oil
8 eggs, separated
¼ cup lemon juice
¼ cup water
2-1/2 tbsp grated lemon zest
6 tbsp butter , melted
1 tbsp grated lemon zest
2 cups powdered sugar
3 tbsp lemon juice
1 tsp vanilla extract