Preheat oven to 325 degrees F. Thoroughly grease and flour a standard 12 cup Bundt pan.
With an electric mixer, beat the butter, sugar and salt (if using) until light and creamy, scraping bowl often.
Add eggs one at a time, beating well after each addition.
Stir in flavorings (zest and vanilla).
Alternately add flour and sparkling water. Mix after each addition.
Pour into pan and bake at 325 degrees F. for 60 to 80 minutes or until a skewer inserted comes out clean.
Let cool in pan for 10 minutes, then remove from pan and let cool completely. Drizzle with glaze.
To make the glaze, mix together 1 cup powdered sugar and the 2 tablespoons of juice or just enough to make it thick enough to flow from a spoon.