Preheat the oven to 325°F. Grease and flour a large 10-inch bundt pan. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment or a large mixing bowl with electric mixer, beat the softened 1 1/2 cups unsalted butter for 3-4 minutes or until light and fluffy.
Add the 3 cups sugar and cream together until light and fluffy. Add the 5 eggs, one at a time, until incorporated.
Sift or whisk together the 3 cups flour, 1/2 teaspoon fine sea salt and 1/2 teaspoon baking soda.
Mix the 3/4 cup 7 Up soda with the 1 tablespoon lemon juice and 1 tablespoon lime juice.
Alternating, add the 7-Up mixture and then flour mixture until all is just combined.
Transfer to the prepared bundt pan.
Bake, uncovered, for 1 hour 10 minutes. Use the toothpick test to determine if the cake is done. Baking times can vary based on the actual size and decoration of the pan you use.
Remove and allow to cool for 10-15 minutes. Invert onto a wire rack and remove from pan to cool fully. Do this while the cake is still warm. If you wait until it is fully cooled, you have a higher risk of the cake not coming out smoothly. Trust me, I've done this before...
After the cake is fully cooled, whisk together the 3 cups powdered sugar with 2 tablespoons lemon or lime juice and 1/4 cup 7 Up soda. Drizzle over the cake while still on wire rack so the glaze can drip off (place on a piece of parchment or baking sheet to catch the extra).
While still tacky, add the chopped 1/2 cup Maraschino cherries.
If you've tried this recipe, come back and let us know how it was in the comments or ratings.