Rhubarb Cake
Bake Rhubarb Cake: tender, tangy 9x13 cake studded with fresh rhubarb for warm, shareable moments.
Ingredients
- 2 cups all-purpose flour
- 1 teaspoon salt
- 1 teaspoon baking soda
- 1 ½ cups granulated sugar
- 1 cup milk
- ½ cup unsalted butter (melted)
- 1 ½ tablespoons fresh lemon juice
- 1 teaspoon vanilla extract
- 1 large egg (room temperature)
- 3 cups chopped fresh rhubarb (chopped)
- 2 tablespoons granulated sugar
- ¼ teaspoon cinnamon
Instructions
Step 1: Preheat and Prepare the Pan
Preheat the oven to 350°F and grease a 9x13-inch rectangular baking pan thoroughly so the cake releases cleanly after baking. I like to rub a thin layer of butter over the inside and give it a light dusting of flour or lay down a bit of parchment on the long sides; this step sets you up for an intact rectangular shape later on, so take a moment to make the pan ready.
Step 2: Whisk the Dry Mix
In a large matte pale grey ceramic bowl, whisk together the all-purpose flour, salt, and baking soda until evenly distributed and airy. This dry mix is the structural backbone of the cake — taking a few gentle whisks now ensures even rise and a uniform crumb later.
Step 3: Make the Wet Mix
In a separate small glass jug or bowl, combine the granulated sugar, milk, melted unsalted butter, fresh lemon juice, and vanilla extract, stirring until the sugar starts to dissolve and the liquids look glossy. Crack in the large room-temperature egg and whisk just until incorporated; the wet mix should be smooth and homogenous, with a slightly syrupy sheen from the melted butter.
Step 4: Fold Rhubarb into the Dry Mix
Toss the chopped fresh rhubarb into the bowl with the whisked dry ingredients and gently fold so the pieces are evenly coated and distributed. Coating the rhubarb in flour first keeps the pieces suspended in the batter instead of sinking, and you’ll start to notice pink-streaked flour pockets where the rhubarb’s juices begin to cling — that’s a good sign.
Step 5: Combine Wet and Dry into Batter
Pour the wet mixture into the flour-and-rhubarb bowl and stir with a wooden spoon until the batter looks fully combined — moist, thick but pourable, with visible pink/red rhubarb chunks throughout. Avoid overmixing; stop when streaks of flour disappear and the batter sits in a cohesive mass.
Step 6: Transfer to Pan and Add Topping
Spoon and scrape the batter into the prepared 9x13-inch rectangular pan, smoothing the top with an offset spatula so the surface is even. In a tiny bowl mix the topping sugar with the cinnamon and sprinkle it uniformly over the batter so the top will caramelize into a slightly crisp, speckled crust as it bakes.
Step 7: Bake Until Set
Bake in the preheated oven for 40–45 minutes, or until a toothpick inserted near the center comes out clean and the top is a warm golden-brown with speckles of caramelized sugar and cinnamon. The cake will puff slightly and the rhubarb bits will show faint pink stains through the surface.
Step 8: Cool Briefly
Remove the rectangular pan to a cooling rack and let the cake cool for a short while until it reaches warm, hand-holdable temperature — cooling stabilizes the crumb and makes it easier to slice into neat rectangular pieces without collapsing.
Step 9: Serve with Vanilla Ice Cream
Slice a neat rectangular piece from the pan and plate it as a rectangular bar; serve warm with a generous scoop of glossy vanilla ice cream on top so it melts slowly into the warm crumb. The final bite should combine a lightly crisp, cinnamon-speckled top, a tender buttery cake studded with tangy pink rhubarb, and creamy melting ice cream.
Notes
- Use firm, brightly colored rhubarb stalks for the best texture and flavor.
- Toss rhubarb with a bit of flour to keep pieces from sinking in the batter.
- Brown the butter for a deeper, toffee-like flavor variation.
- Reduce sugar by 1/4 cup if you prefer a less sweet cake.
- Warm slices briefly in the oven before serving with ice cream for best aroma and texture.