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Ingredients
4 cups chopped rhubarb
1 cup white sugar
1 (3 ounce) package strawberry-flavored Jell-O® mix
3 tablespoons quick-cooking tapioca
1 (18.25 ounce) package white cake mix
1 cup water
⅓ cup vegetable oil
3 eggs
Preparation
Step1
Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking pan.
Step 2
Mix rhubarb, sugar, strawberry gelatin mix, and tapioca in a bowl. Spread the rhubarb mixture into the bottom of the prepared baking pan.
Step 3
Beat white cake mix, water, vegetable oil, and eggs in a large mixing bowl until moistened; beat with an electric mixer on medium speed for 2 minutes. Pour the cake batter over the rhubarb mixture.
Step 4
Bake in the preheated oven until a toothpick inserted into the middle of the cake layer comes out clean, about 35 minutes. Let the cake stand for 5 to 10 minutes before inverting on a plate.