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Grease and flour a 9" X 13" pan and preheat the oven to 350 F.
Put the rhubarb in the bottom of the pan and sprinkle evenly with the sugar and the jello.
Spread marshmellows over the rhubarb.
Mix the cake per the directions and pour over the top.
Bake for 55 minutes.
Allow to cool completely and then turn out on a large platter.
Number of Servings:
Time to Prepare: