Baked Treats

Rhubarb Rosette Upside-Down Cake

April 12, 2018

Gorgeously colored from ruby to pinky-red with blushes of celery green that take on a satiny-sheen in the light, rhubarb is soooo pretty. It’s also delightfully odd. Super-tart rhubarb is actually a perennial vegetable, not a fruit, in spite of being called the “pie plant” in 19th century cookbooks. It comes in season in April peaks in June and if you’re lucky, hangs around in the home garden until September. It has a very distinct aroma—sharp, sort of vegetal funky—and if I had to put a color to the scent: red-brown. And although it very-much resembles celery (with its fleshy stalks and “strings,”) unlike celery, rhubarb cooks VERY quickly, and the strings entirely disappear, making it a lovely choice for topping this sweet-tart of an upside-down cake.  

Upside-down cakes fill my vintage community cookbook collection, favored, I think, for their buttery-good rusticity, and because they can be beautiful without the need for frosting. But some of these vintage versions are upside-“downers” including cake batters that are less-than wonderful, and toppings that dip below rustic to become somewhat unappealing. With this up-do, I’ve tried to raise the bar to produce a one-pan cake you’ll be proud to serve.

Featuring a beautiful, scratch-made yellow cake batter this recipe yields a tall, tender-crumbed cake with good structure, never gummy or oily, that you will turn to as the base for other cakes you make. (It’s my Charlie boy’s absolute favorite—all by itself with no fruit or frosting!) As well, I’ve topped (bottomed?) the cake with rhubarb-rosettes and a delicious rhubarbanana syrup. The steps to make the syrup and rosettes take a little time, but the flavors and looks are worth it. Bonus: You’ll have extra rhubarb syrup when you’re done to swirl into soda, or over ice cream or yogurt. I think this cake is very best the day you bake it, served with dollops of fresh whipped cream or crème fraiche, and a drizzle of the rhubarbanana syrup.

Please Note: This cake requires day-ahead prep: To make the syrups for this cake, you’ll need to freeze 10 ripe bananas the day before you want to bake the cake. And, the rhubarb rosettes need to be refrigerated overnight.

Rhubarb Rosette Upside-Down Cake
Yields 1
Beautiful scratch-made yellow cake batter topped with ribbon-bright rosettes of ruby rhubarb, this upside down cake is a best of class one-pan cake
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Ingredients
  1. Banana Syrup
  2. 10 ripe (or overripe) peeled, frozen bananas
  3. Rhubarb Rosettes
  4. 4, 14-inch long stalks of fresh rhubarb, washed, ends trimmed to make 10-inch finished pieces
  5. Box of toothpicks
  6. Ice water
  7. Rhubarb Syrup
  8. 2 cups chopped rhubarb (from the trim of the stalks you make the rosettes from)
  9. 1 cup cool water
  10. ½ cup sugar
  11. Rhubarbanana Syrup
  12. 1/2 cup plus 2 Tablespoons banana syrup
  13. ½ cup rhubarb syrup
  14. juice from baking the rosettes (below)
  15. Rhubarb Rosette Upside Down Cake
  16. 1, 9-inch cake pan with parchment liner
  17. Rosettes from four stalks of rhubarb
  18. ½ cup sugar for dipping
  19. 1 Tbsp butter for baking the rosettes
  20. 3 large egg yolks (save the whites for another use)
  21. ¾ cup whole milk, divided
  22. ¼ cup sour cream
  23. 1 teaspoon vanilla extract
  24. ¾ cup granulated pure cane sugar
  25. 1 ½ cups cake flour
  26. 2 teaspoons baking powder
  27. ½ teaspoon salt
  28. 1 stick unsalted butter at room temperature, cut into 1/4-inch cubes (plus 1 tablespoon butter greasing the cake pan)
Instructions
  1. Make rhubarb rosettes: Using a mandolin slicer set to the thinnest blade setting, take four stalks of rhubarb you have trimmed to 10-inch lengths and, one at a time, carefully, repeatedly push each stalk through the mandolin to create lengthwise strips of the rhubarb. Take each strip and starting on one end, roll up the strip to make a curl. Skewer each curl with a toothpick. Continue until you have enough curls to fill the bottom of a 9-inch cake pan. Place rosettes in a tall container of ice water, cover. Refrigerate overnight.
  2. Make banana syrup: Place 10 frozen bananas in a microwaveable bowl. Microwave on high heat for five to six minutes until bananas are completely thawed and have released their juice. Place all in a fine mesh strainer over a bowl to collect the juice. You should have a bit more than 1 cup of juice—if there is a bit more, that is fine--you will be reducing this to make the syrup. Reserve the banana pulp for another use. Place the banana juice in a heavy-gauge pot over medium low heat. Simmer, whisking occasionally, until the juice has reduced almost by half. Remove pot from heat. Set aside.
  3. Make rhubarb syrup: Place chopped rhubarb, water and sugar in heavy gauge pot over medium-high heat; heat to boil. Immediately reduce heat to simmer slowly until soft; 15 to 20 minutes. Remove from heat. Pour all into a fine mesh sieve over a bowl. Stir the rhubarb in the sieve to push a bit more syrup through the strainer. You should have about 1 cup of syrup. NOTE: YOU WILL USE 1/2 CUP OF THIS FOR THE RHUBARBANANA SYRUP; the rest you can save to make fizzy drinks or yogurt toppers or whatever you like. Set aside. Reserve the cooked rhubarb for another use (eat with yogurt etc.)
  4. Make rhubarb rosette upside down cake: Preheat oven to 350. Remove rhubarb rosettes from icewater. Blot dry on kitchen toweling. Remove toothpicks. If the rosettes have split a bit, it’s okay: just trim the ends and discard the trim and toothpicks. Generously butter and line a nine-inch cake pan with parchment round. Looking at each rosette, determine which side is “prettiest.” Dip each rosette (both sides) in sugar. Place each sugared rosette—“prettiest” side DOWN—flat on the bottom of the cake pan. Continue until you have fit as many of the rosettes as you can to cover the bottom of the pan. Dot with 1 Tbsp of slivered butter. Cover cake pan with foil. Place in preheated oven and bake rosettes for 12 minutes. Remove from oven. Remove foil. Very carefully, pour off the juice and butter that has collected in the pan into a bowl. Place the bowl of juices in the refrigerator to completely cool while you make the cake batter.
  5. Make cake batter: In a small bowl, whisk egg yolks with 1/4 cup of the milk, the sour cream and the vanilla. Set aside. In the bowl of a stand mixer with whisk attachment, combine the sugar, cake flour, baking powder and salt. Whisk for two minutes at medium speed. Turn of the mixer to add the butter cubes and remaining ½ cup of milk. Whisk for two minutes at low speed, scarping side of bowl as needed, and then increase to medium-high speed until you have a smooth, thick batter. Turn mixer off to add the reserved egg/milk mixture in three parts, beating until just incorporated after each addition. Set aside while you finish the syrups. Remove the chilled rhubarb butter juice you collected from the refrigerator. Skim off the butter solids and place these back in the cake pan. Pour the collected juices through a fine mess strainer into a small, heavy-gauge pot. Add ½ cup of the reserved rhubarb syrup. Add all of the reserved banana syrup. Heat over medium heat until the syrups begin to bubble, continue heating whisking constantly until the mixture has reduced again by just about half, to a thick syrup. Remove from heat. Drizzle 3 tablespoons of the syrup over the rhubarb rosettes and butter in the cake pan. Save the rest of the rhubarbanana syrup to serve with the cake. Spoon all of the cake batter over the rhubarb rosettes, spreading to smooth the batter. It will completely fill the pan. Bake at 350 for 35 minutes. (Note: the cake will dome somewhat, but it will level as it cools.) Remove cake from oven to cooling rack. Cool for 15 minutes. Using a sharp knife, slip knife around the inside edge of the cake pan to ensure it will loosen from the pan when you invert the cake. Place serving platter over the cake; invert to release the cake from the pan. Serve slices of the cake with whipped cream, iced cream or crème fraiche and a drizzle of the reserved rhubarbanana syrup.
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