I love Rhubarb Cake. Caramel and orange juice make this one special. During rhubarb season we make this cake frequently.Cooking time does not include chilling time. You can bake the bottom and cook the rhubarb the night before. Make glaze and fill cake in the morning.- NOTE: it is advantageous to have a special form for the bottom, but if you us a simple round form, use a metal ring around the baked cake when you fill it. Remove carefully when filling has set.