Preheat the oven to 325 degrees F. In a large bowl, whisk together lemon cake mix and lemon pudding mix. Add eggs, water and vegetable oil. Mix well until you have a smooth texture.
Fold in 1 tsp lemon zest. Pour the batter into a bundt pan sprayed with non stick spray (mine was a 10.5 inch pan). Bake for approximately 40-45 minutes or until toothpick comes out with moist crumbs attached.
Remove and let cool before putting a large plate or platter on top and gently flipping it over to fall out. Top with powdered sugar if desired.