Step 1: Preheat Your Oven. Preheat your oven to 325°F (163°C). Grease your bundt pan with butter or a non-stick spray to prevent sticking.
Step 2: Mix Dry Ingredients. In a medium bowl, whisk together the all-purpose flour and salt. Set aside.
Step 3: Cream Butter and Sugar. In a large mixing bowl, use an electric mixer to cream together the softened butter, vegetable shortening, and granulated sugar until light and fluffy, about 4-5 minutes.
Step 4: Add Eggs and Flavors. Add the eggs one at a time, mixing well after each addition. Stir in the grated lemon zest and vanilla extract until well combined.
Step 5: Combine Wet and Dry Ingredients. Gradually add the flour mixture to the butter mixture, alternating with the 7-Up or Sprite. Start and end with the flour mixture. Mix until just combined.
Step 6: Bake the Cake. Pour the batter into the prepared bundt pan and smooth the top. Bake in the preheated oven for about 55-60 minutes, or until a toothpick inserted comes out clean.
Step 7: Cool the Cake. Once baked, remove the cake from the oven and allow it to cool in the pan for about 10 minutes. Then, gently invert the cake onto a cooling rack to cool completely.
Step 8: Prepare the Glaze. While the cake is cooling, whisk together the powdered sugar, lemon juice, and milk until smooth. Adjust the consistency if necessary.
Step 9: Glaze the Cake. Once the cake is completely cooled, drizzle the glaze over the top, allowing it to drip down the sides.
