For the cake, mix yellow cake mix, vanilla pudding and poppyseeds. Add juice, oil, and sour cream and mix. Add 4 eggs one at a time, mix well.
Grease and flour a bundt pan. Bake at 350 degrees for 40-45 minutes (don’t overbake).
When the cake is about 10 minutes from being done start the glaze.
For the glaze, bring ingredients to a boil and keep bubbling until ready to pour over cake. You can either pour the glaze over the cake while it is in the pan or turn the cake out onto a cooling rack and pour the glaze over the cake that way. It is really like syrup that soaks in. (Some commenters have said that glazing the cake in the pan makes it hard to remove because the glaze gets sticky. I glazed it out of the pan and it worked great.) Give it a few minutes to soak in and then turn it out onto a cake plate. Optional: dust top of cake with powdered sugar.