Preheat the oven to 350 degrees F. Spray a 8.5x4 inch loaf pan with nonstick baking spray and set aside.
In a medium sized bowl, mix together the dry ingredients - flour, cornstarch, baking powder, ground ginger, and kosher salt.
In a small bowl, make the lemon sugar. Combine lemon zest and sugar. Pinch together for about 3 minutes, until sugar becomes a pale yellow.
In the bowl of a stand mixer fitted with the paddle attachment, add room temperature butter, vegetable oil, and lemon sugar and cream together on medium speed for 5 minutes. Then add eggs, one at a time.
Add lemon extract and vanilla extract and continue to mix until combined.
Add half of the dry ingredients into the bowl, then add the milk, and then the remaining dry ingredients. Mix until combined and smooth.
Pour batter into the loaf pan and bake for 45-50 minutes, until a toothpick comes out clean. Allow the cake to cool in the pan for 5 minutes, then turn onto a wire rack to cool completely.
Once cooled, make the white chocolate lemon glaze. In a small bowl, add 2 tbsps of heavy cream and white chocolate and microwave for 30 seconds. Whisk together until all chocolate is melted. If not fully melted, microwave for an additional 10 seconds. Whisk in remaining 1-2 tbsps of heavy cream and add lemon extract.
Pour glaze on top of the loaf.