• Preheat your oven to 325°F.
• Grease and flour a Bundt pan.

Make the Cake Batter:

• In a medium bowl, whisk together the flour, baking powder and salt. Set aside.
• In a large mixing bowl, cream the butter and sugar together until very light and fluffy, making sure to scrape down the sides of the bowl halfway through, 10 to 15 minutes.
• Add the eggs one at a time, beating well after each addition until fully incorporated.
• Gradually add the flour mixture to the butter mixture, mixing just until combined.
• Add the lemon zest, and lime zest and slowly pour in the 7-Up soda. Gently mix until the soda is incorporated.
• Pour the batter into the prepared Bundt pan, spreading it evenly.

Bake the Cake:

• Bake for 75 to 85 minutes, or until a toothpick inserted into the center comes out clean.
• Allow the cake to cool in the pan for 10 minutes before turning it out onto a wire rack to cool completely.

Make the Glaze:

• Once the cake is cooled, make the glaze by whisking together the powdered sugar, 7-Up and lemon zest.
• Add more powdered sugar or 7 up until you get to a thick pourable consistency.
• Drizzle glaze over cake and serve.