1 pkg. yellow cake mix
5 c. diced rhubarb
1 (3 oz.) pkg. strawberry Jello
1 c. sugar
1 c. miniature marshmallows

Grease 13"x9" pan and place rhubarb, dry Jello, sugar and marshmallows evenly over bottom of pan. Prepare cake mix according to directions. Pour prepared cake mix over ingredients in pan. Bake at 350 degrees for 59 to 60 minutes. Invert onto serving tray first before serving. Top with whipped topping.