This delightful Rhubarb Pineapple Upside-Down Cake combines the tartness of fresh rhubarb with the sweetness of pineapple for a delicious summer dessert that everyone will love.
Begin by preheating your oven to 350ºF and greasing a 13x9x2-inch baking pan. Place it aside for later.
In a large mixing bowl, blend the cake mix, water (or pineapple juice), softened butter, and eggs until just moist, then blend at medium speed for about 2 minutes. Set this mixture aside.
In another medium bowl, combine the rhubarb, crushed pineapple, granulated sugar, brown sugar, and strawberry Jell-O. Mix thoroughly by hand to ensure even distribution.
Spread the rhubarb mixture evenly onto the bottom of the greased pan.
Carefully pour the cake batter over the rhubarb layer, using a spoon to spread it evenly across the top.
Bake the cake for around 55 minutes, or until the top is a lovely golden brown. A toothpick inserted in the center should come out clean to verify doneness.
Allow the cake to cool slightly before serving. It can be enjoyed warm or cooled completely and refrigerated for later.
When ready to serve, add a generous topping of Cool Whip or Reddi-wip whipped cream.