Rhubarb Custard Cake - Aunt Polly

1 pkg. yellow cake mix
4 c. rhubarb, chopped
1 c. sugar
1 pt. whipping cream

Prepare cake mix according to directions. Turn into lightly greased 9 x 13 x 2-inch pan. Cover with rhubarb, then sprinkle sugar over the top. Then the cream last over all. Bake at 350 degrees, 50 to 60 minutes, or until cake springs back when lightly touched. Cream and rhubarb form a custard on the bottom.