8 to 10 c. rhubarb
1 c. sugar
2 boxes raspberry jell-o, sugar free
1 white or yellow cake mix
1/2 c. water
1 stick butter

Layer ingredients in 9 x 13 pan in order given. Cut 1 stick butter in small pieces and spread over cake.

Bake at 350°F until light brown about 35-45 minutes.