Spray a large Bundt pan with nonstick baking spray. Preheat oven to 350 degrees F.
Sift together flour, sugar, baking powder, baking soda and salt. Then put mixture into a stand mixer add eggs, and mix until combined. Then add oil; mix until blended. Next add grapefruit and orange juices, and banana and mix until smooth and creamy. Lastly add sour cream and zests; just mix until combined and smooth.
Put cake batter into a 10-inch the prepared pan and bake for about 35 to 45 minutes or until a toothpick inserted in the center comes out clean.
When done turn pan onto serving platter let stand about 15 minutes then poke small holes in top. I use a straw; be neat about it. Pour Glaze Sauce on partially cooled cake. Let cool about 1 hour and serve. We like it with a scoop of dream sickle ice cream on the side and a sprig of mint.
This could be a layer cake with cream cheese icing.
Mix juice and sugar until combined. If it is too thick add more juice a tablespoon at a time. Stir in zest and pecans.
A viewer or guest of the show, who may not be a professional cook, provided this recipe. It has not been tested for home use.