The first time I tasted rhubarb dump cake was on a folding chair in Traverse City, Michigan, while a sommelier named Pete poured me a glass of late-harvest riesling and told me it would change my mind about American desserts.
I had taken the cooking class on a whim. A friend told me Traverse City was worth a long detour after a wedding in Chicago, and the class was the only thing I could book that week. The instructor, a soft-spoken woman named Marjorie who ran the school out of a converted carriage house off Sixth Street, walked us through cherry galettes and a pickled-mustard ham. Then she pulled a battered glass pan out of the oven that smelled like nothing else in the room.
That was the cake. Pink syrup bubbling at the edges, a crackly top that broke under the spoon. Pete had wandered in from the tasting room next door with the riesling because, he said, sweet wine and tart rhubarb want each other. He was right. I have not eaten the cake without something cold and slightly sweet next to it since.
I went home thinking about it for weeks.
What Marjorie Told Us in Traverse City
She was clear about one thing. A dump cake is not a cobbler. Cobblers want a homemade biscuit or batter on top. A dump cake’s whole identity comes from undisturbed dry cake mix moistened with melted butter and time in the oven. Stir it and you have ruined it.
It is a mid-20th-century American convenience dessert. The name comes from the technique of dumping everything into one pan without mixing. The earliest published recipe under that exact name traces to the Sapulpa Daily Herald in 1964, and Duncan Hines pushed it into the mainstream around 1980. The rhubarb version is a Midwestern thing, born of backyard rhubarb patches and home cooks who did not want to wrestle with pie crust.
Marjorie said her grandmother in Petoskey used to bring it to church potlucks in a pan with a chipped lid. That tracked with what I read later. This is church-basement food. The kind of pan that gets passed around at Memorial Day cookouts and is gone by sundown. Forgiving, thrifty, built to feed a long table from one dish.
Bringing the Rhubarb Dump Cake Back to My Kitchen
The rhubarb part was the hardest. LA is not a rhubarb town. I get mine at the Wednesday Santa Monica farmers market for about three weeks in April and May, and after that I rely on the freezer. The vendor I buy from is a woman named Linh who keeps her rhubarb at the back of the stand under a wet cloth so it does not wilt in the sun.
The rest is easy. Yellow cake mix, strawberry gelatin, sugar, butter. The gelatin is what makes the syrup the color it is. I held out against it for one round and tried it without. The cake was fine and the color was muddy and Pete would have shaken his head.
I never use boxed cake mix. Except for this.
What I Used
- 6 cups fresh rhubarb, sliced into half-inch pieces
- 1 cup granulated sugar
- One 3-ounce box of strawberry gelatin powder, the Jell-O kind
- One 15.25-ounce box of yellow cake mix, dry and untouched
- 3/4 cup unsalted butter, melted
- 1/4 cup cold water, drizzled over any dry spots
- A 9×13 glass baking dish, lightly greased
- Vanilla ice cream for serving, not optional in this house
Building the Cake on a Saturday Afternoon
I make this on Saturday afternoons when I have nothing else on. Oven to 350 F. Rhubarb sliced and spread in the pan in an even pink layer. Sugar across the top. Then the strawberry gelatin, dry, straight from the box, no stirring. The gelatin always looks like too much. It is not.
I put Bon Iver on the speakers because Marjorie had been playing him in the kitchen that day, and I poured myself a small glass of riesling because that felt right too. The cake mix went over the fruit in a loose blanket, corner to corner. The water came next, drizzled over the powdery dry spots. Then the melted butter, slow and deliberate, trying to soak every last patch. My apartment smelled like a candy store and an old farmhouse at the same time.
The first time I made this I rushed the butter and ended up with chalky white patches across the top. They taste like flour. They will not be saved by ice cream. Take the extra minute.
In the oven for fifty-five minutes. I ate a small wedge of cheddar and a sleeve of saltines while I waited, because that is what was on the counter. The dog parked himself in front of the oven door and refused to move.
You want it bubbling thickly at the edges with a deep golden top and crisp craggy patches. Let it rest at least twenty minutes after it comes out. The juice needs time to set into syrup. If you spoon it too soon you get pink soup. Not the end of the world. But not what Marjorie made.
Variations I Have Tried and One I Will Not
The strawberry-rhubarb version, where you swap about a third of the rhubarb for sliced fresh strawberries, is honestly very good. I tried it last May when the Harry’s Berries at the market were too pretty to pass up.
Frozen rhubarb works. Do not thaw it. Add five minutes to the bake.
I once tried this with white cake mix instead of yellow. The flavor was thinner. The yellow has more egg and more butterfat baked into the mix, and the cake suffers without it.
I will not try this with a sugar-free cake mix. Marjorie warned me about it. I trust her.
Serving It the Way Pete Would
Warm, with vanilla ice cream that melts into the pink syrup. The cold against the hot rhubarb is the whole point. Some people add whipped cream instead, which is fine, but the ice cream is correct.
If you want to do the riesling pairing, any off-dry bottle will do. I have used a Pacific Northwest one in a pinch. Pete would tell me to find a Michigan riesling, and Pete would be right.
Leftovers keep covered in the fridge for three days. Reheat uncovered at 325 F to crisp the top back up. Cold straight from the pan with a spoon is also acceptable, especially on a Sunday morning before anyone else is up.
I think about that carriage house in Traverse City every spring when the rhubarb shows up at Linh’s stall. Marjorie sent me a postcard the year after the class with a sketch of the pan on it. I have it pinned to my fridge.
Rhubarb Dump Cake
Ingredients
Equipment
Method
- Preheat the oven to 350 F. Lightly grease a 9x13 inch baking dish with butter or nonstick spray.
- Trim the rhubarb stalks, discarding any leaves, and slice the stalks into 1/2 inch pieces until you have 6 cups. Spread the rhubarb in an even layer across the bottom of the prepared baking dish.
- Sprinkle the 1 cup of granulated sugar evenly over the rhubarb, followed by the entire 3 oz box of dry strawberry gelatin powder. Do not stir.
- Open the box of yellow cake mix and sprinkle the dry mix evenly over the fruit, covering it completely from corner to corner. Resist the urge to stir or pat it down — a loose, even layer is what gives you the crackly top.
- Drizzle the 1/4 cup of cold water slowly and evenly over the dry cake mix, focusing on any powdery dry spots.
- Melt the 3/4 cup butter in a small saucepan over low heat, then drizzle it slowly and evenly across the entire surface of the cake mix. Take your time so as much of the dry mix as possible is moistened; the unmoistened spots will stay floury and chalky after baking.
- Bake on the middle rack for 50 to 60 minutes, until the rhubarb is bubbling thickly around the edges and the top is deep golden brown with crisp, craggy patches.
- Remove from the oven and let the cake rest for at least 20 minutes so the rhubarb juices can set into a glossy pink syrup.
- Scoop into bowls while still warm and serve with vanilla ice cream or softly whipped cream.