5 c. rhubarb
1 (large) raspberry Jello
4 c. miniature marshmallows
1 pkg. white or yellow cake mix
1 c. sugar

Cut up rhubarb and put into a greased 9 x 13 inch cake pan. Sprinkle with the dry Jello. Sprinkle on the sugar and marshmallows. Mix cake mix with only water and eggs and pour over rhubarb. Bake at 350 degrees for 1 hour. Check with toothpick. Let sit 10 minutes (but no longer - the middle will fall in) and turn over onto cookie sheet. Serve with whipped cream or Cool Whip.