Orange Pound Cake

Preheat the oven to 325 degrees F (165 degrees C).

Grease and flour a 10-inch fluted tube pan (such as Bundt®).

Sift flour, baking powder, salt, and baking soda together in a bowl; set aside.

Beat white sugar and butter together in a large bowl with an electric mixer until light and fluffy, about 3 minutes.

Beat in eggs one at a time, then beat in vanilla extract and orange zest.

Add flour alternately with sour cream in 3 additions, beginning and ending with flour.

Beat until smooth.

Scrape the sides of the bowl with a rubber spatula.

Spread evenly in the prepared pan.

Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 1 hour and 15 minutes.

Cool on a wire rack for 10 minutes, then unmold the cake onto the wire rack to cool completely.

While the cake is cooling, bring orange juice, sugar, and orange zest to a boil in a small saucepan over medium-high heat.

Reduce heat and cook until syrupy, about 15 minutes.

Remove from heat and whisk in butter, 1 tablespoon at a time.

Drizzle warm syrup over cake slices.