Place the top oven rack in the center position and preheat the oven to 350°F. Prepare a standard-sized Bundt pan by spraying it with non-stick cooking spray.
Cream the butter and 1 cup of sugar in a large mixing bowl. Add the vanilla, eggs, lemon juice, and sour cream, mixing until smooth.
In a separate bowl, combine the flour, baking soda, baking powder, poppy seeds, and lemon zest. Gradually add the dry ingredients to the wet ingredients, mixing until smooth.
Transfer the cake batter to the prepared Bundt pan and bake for 45-50 minutes or until golden brown on top and a toothpick inserted into the center comes out clean.
While the cake is baking, prepare the lemon glaze by blending the ingredients until smooth. Set aside.
Once baked, place the hot pan on a wire rack to cool for 30-40 minutes. To serve, remove the cake from the pan and slice, drizzling with lemon glaze right before serving.