Cut up rhubarb and put into bottom of greased 9x13 inch cake pan. Sprinkle 3 oz. strawberry Jello over rhubarb, then 1 cup ... marshmallows over sugar. Mix yellow cake mix as on ... for upside down cake.
Prepare cake mix according to directions. Place marshmallows ... over marshmallows. Combine rhubarb, sugar and water in ... and stir in Jello. Pour over cake batter. ... serve with Cool Whip.