Sourdough Discard Rhubarb Cake
This Sourdough Discard Rhubarb Cake is tender, tangy, and beautifully moist, making it the perfect way to use up your starter while celebrating rhubarb season. A stunning English-inspired bake that works just as well for Easter breakfast as it does for afternoon tea.
The Best Way to Use Sourdough Discard Right Now
If you have been keeping a sourdough starter for any length of time, you know the drill. Feeding day arrives, and you are left staring at a jar of discard wondering what to do with it before it becomes yet another guilty scraping into the bin. This Sourdough Discard Rhubarb Cake is the answer you did not know you were looking for.
This is a genuinely beautiful bake. The batter is tender and richly flavored thanks to butter, brown sugar, and a good dollop of sour cream. The sourdough discard adds a subtle fermented tang that lifts the whole thing and gives the crumb a depth you simply cannot get from a plain butter cake. And the rhubarb, bright pink and jammy from a quick toss in sugar, cuts through the sweetness in the most satisfying way.
It fits just as naturally on an Easter breakfast table as it does at an afternoon tea spread. If you are looking for sweet sourdough loaf recipes or quick discard dessert recipes that actually impress, this one delivers on every count.
Why This Recipe Works So Well
A lot of sourdough discard pastry recipes use the starter almost as an afterthought, adding a tablespoon or two for the label rather than the flavor. Here, half a cup of discard goes into the batter, and you genuinely taste it. It works in harmony with the baking soda to create a light, even crumb while lending that gentle English-bakery sourness that makes the cake taste complex without being difficult.
Rhubarb is the natural partner for this kind of tang. Its sharpness balances the butter and sugar perfectly, and because it softens into tender pockets during baking rather than dissolving entirely, every slice has little bursts of fruit throughout.
Baker's Note: Use rhubarb stalks that are as pink as possible for the best visual result and the brightest flavor. Very green stalks are more fibrous and less sweet.
This is also a wonderfully forgiving recipe. It belongs in the same family as the best bakery food recipes: straightforward technique, reliable results, and a final product that looks far more effortful than it actually is.
Before you start, it is worth having the right equipment on hand. A reliable electric hand mixer makes creaming the butter and sugar much faster and ensures a properly aerated batter, which is what gives this cake its light, springy texture.
Tips for the Perfect Sourdough Discard Rhubarb Cake
A few small details make a real difference here:
- Room temperature ingredients matter. Cold butter will not cream properly, and cold eggs can cause the batter to split. Pull everything out of the fridge at least 30 minutes before you begin.
- Do not overmix once the flour goes in. Fold gently until just combined. Overworked gluten makes for a dense, tough cake rather than a tender one.
- Macerate your rhubarb. That quick toss in sugar draws out some moisture and concentrates the flavor before it ever hits the oven. Do not skip this step.
- The demerara topping is non-negotiable. That crackly, caramelized sugar crust on top is what takes this from a simple different sourdough recipe into something that looks genuinely bakery-worthy.
Chef's Tip: If you want a stronger sourdough flavor, use discard that has been sitting in the fridge for a full week rather than fresh discard. The longer fermentation time intensifies the tang beautifully.
Perfect for Easter and Beyond
Among Easter breakfast pastries, this cake stands out because it requires no yeast activation, no shaping, and no special timing. You mix, pour, bake, and slice. It is the kind of thing you can have on the table while everyone is still in their pajamas, which is exactly where Easter morning belongs.
As a dessert made with sourdough discard, it also works brilliantly as an afternoon treat served with a spoonful of crème fraîche or a light dusting of powdered sugar.
Here is everything you need to make it:
Sourdough Discard Rhubarb Cake
This Sourdough Discard Rhubarb Cake is tender, tangy, and beautifully moist, making it the perfect way to use up your starter while celebrating rhubarb season. A stunning English-inspired bake that works just as well for Easter breakfast as it does for afternoon tea.
Ingredients
- 2 cups all-purpose flour, spooned and leveled
- 1 1/2 tsp baking powder
- 1/2 tsp baking soda
- 1/2 tsp fine sea salt
- 1/2 tsp ground cinnamon
- 1/2 cups unsalted butter, softened to room temperature
- 3/4 cups granulated sugar
- 1/4 cups light brown sugar, packed
- 2 large eggs, room temperature
- 1 tsp pure vanilla extract
- 1/2 cups sourdough discard, unfed, at room temperature
- 1/4 cups whole milk, or buttermilk for extra tang
- 1/4 cups sour cream, full fat
- 2 cups fresh rhubarb, trimmed and cut into 0.5-inch pieces
- 2 tbsp granulated sugar, for tossing with rhubarb
- 2 tbsp coarse sugar or demerara sugar, for sprinkling on top
Instruction
Preheat your oven to 350 degrees F (175 degrees C). Grease a 9-inch round cake pan or an 8x8-inch square baking pan and line the bottom with parchment paper.
In a medium bowl, toss the chopped rhubarb with 2 tablespoons of granulated sugar. Set aside to macerate while you prepare the batter.
In a large bowl, whisk together the flour, baking powder, baking soda, salt, and cinnamon until combined.
In a separate large bowl, beat the softened butter with the granulated sugar and brown sugar using an electric hand mixer or stand mixer on medium speed for 3 to 4 minutes, until the mixture is pale and fluffy.
Add the eggs one at a time, beating well after each addition. Mix in the vanilla extract.
Add the sourdough discard, milk, and sour cream to the butter mixture and mix on low until just incorporated. The batter may look slightly curdled at this stage, which is perfectly normal.
Add the dry ingredients to the wet ingredients and fold gently with a spatula until just combined. Do not overmix.
Fold in about three-quarters of the macerated rhubarb pieces, reserving the rest for the top.
Pour the batter into the prepared pan and spread evenly. Scatter the remaining rhubarb pieces over the surface and sprinkle generously with coarse or demerara sugar.
Bake for 40 to 48 minutes, until a toothpick inserted into the center comes out clean and the top is golden and set. If the top browns too quickly, loosely tent with foil after the 30-minute mark.
Allow the cake to cool in the pan for 15 minutes before transferring to a wire rack. Serve warm or at room temperature.
Equipment
- 9-inch round cake pan or 8x8-inch square baking pan
- Parchment paper
- Electric hand mixer or stand mixer
- Large mixing bowls
- Medium mixing bowl
- Rubber spatula
- Whisk
- Wire cooling rack
Notes
Serving, Storing, and Making It Your Own
This cake is genuinely excellent at room temperature with a cup of tea. For something a little more indulgent, serve it warm from the oven with softly whipped cream or a scoop of vanilla ice cream.
Leftovers keep beautifully, and the flavor actually deepens overnight, making this one of those rare bakes that is arguably better on day two. Wrap slices tightly or store in an airtight container at room temperature for two days, or refrigerate for up to five days.
Want to make it your own? Try adding a teaspoon of freshly grated orange zest to the batter for a citrusy brightness, or scatter a small handful of flaked almonds over the top alongside the coarse sugar for extra crunch. Both variations are simple additions that feel like a completely different sourdough recipe each time.
