Preheat your oven to 350°F (175°C). Prepare a bundt pan by greasing and flouring it thoroughly.
In a medium bowl, combine the cake flour, baking powder, salt, and lemon zest. Whisk together for about 30 seconds to ensure everything is well blended. Set this dry mixture aside.
In another bowl or a large measuring cup, mix the milk, vegetable oil, and lemon extract. Set this wet mixture aside as well.
Using a stand mixer or hand mixer, cream the softened butter until smooth. Gradually add in the sugar and beat at medium speed for 3-5 minutes, or until the mixture becomes pale and fluffy.
Add the eggs one at a time, beating on low speed until each yolk is fully incorporated before adding the next.
With the mixer on its lowest setting, alternately add the dry flour mixture and the wet milk mixture to the butter mixture, beginning and ending with the flour. You’ll add the flour in three parts and the milk mixture in two parts. Be sure to scrape down the sides and bottom of the bowl to ensure all ingredients are well combined. Mix just until smooth—avoid overmixing.
Pour the batter into the prepared bundt pan, smoothing the top with the back of a spoon or spatula.
Bake in the preheated oven for 40-45 minutes, or until a toothpick inserted into the center of the cake comes out clean or with just a few moist crumbs. The cake should spring back when lightly touched. If the top of the cake is browning too quickly, tent it loosely with aluminum foil around the 20-minute mark.
Cool the cake in the pan on a wire rack for about 10 minutes, then invert it onto the rack to cool completely.