Save This delightful British dessert combines the tartness of fresh rhubarb with the bright citrus notes of lemon in a moist, tender crumb. The cake gets its vibrant character from diced rhubarb folded throughout the batter, while the signature drizzle creates a sweet, tangy glaze that permeates every bite.
Ideal for spring and summer occasions, this vegetarian cake takes just over an hour from start to finish and yields eight generous servings. The combination of buttery vanilla sponge with the natural acidity of rhubarb creates a beautifully balanced flavour profile that's neither too sweet nor too tart.
The kitchen smelled like a confused British summer the afternoon I first made this cake, rain lashing the windows while my oven worked overtime to pretend otherwise. Rhubarb and lemon together have a way of tricking you into believing the seasons are cooperating, even when they clearly are not. I had grabbed a bunch of forced rhubarb on impulse, those candy pink stalks practically glowing at me from the market stall, and the rest of the plan assembled itself around them.
I brought this to a friends barbecue once, fully expecting it to be overshadowed by the chocolate brownies someone else had brought. It vanished in fifteen minutes while the brownies sat there looking offended.
Ingredients
- 200 g all-purpose flour and 2 tsp baking powder and 1/4 tsp salt: Sifting these together is the one step you should never skip, because nobody wants a cake with a pocket of baking powder hiding inside like a bitter little surprise.
- 125 g unsalted butter, softened, and 175 g granulated sugar: The butter needs to be genuinely soft, not melted and not fridge cold, so plan ahead or you will be cursing at a bowl of lumpy mixture.
- 2 large eggs, zest of 1 lemon, and 1 tsp vanilla extract: Add the eggs one at a time or the mixture might curdle, and if it does, a spoonful of flour will bring it back from the brink.
- 100 ml milk: Whole milk gives the best texture but semi skimmed works fine in a pinch.
- 250 g rhubarb, trimmed and diced: Cut the pieces fairly small, about the size of a thumbnail, so they distribute evenly and do not sink to the bottom in a soggy heap.
- Juice of 1 large lemon and 75 g granulated sugar for the drizzle: Mix these while the cake bakes so the sugar has time to dissolve into a thin, sharp syrup.
- Extra lemon zest and icing sugar for decoration (optional): A final flourish that makes it look like you tried harder than you actually did.
Instructions
- Get the oven ready:
- Heat it to 180 degrees C (350 degrees F), grease your 20 cm round tin, and line the base with baking paper. This is also a good moment to clear the clutter off your counter because you are about to use every bowl you own.
- Sift the dry ingredients:
- Tip the flour, baking powder, and salt into a sieve and work them through into a bowl. Set aside and enjoy the brief feeling of being organized.
- Beat butter and sugar:
- Using an electric mixer or a whisk and considerable enthusiasm, beat the softened butter and sugar until the mixture turns pale, fluffy, and visibly lighter in texture. This usually takes about three minutes if the butter is properly soft.
- Add eggs and flavorings:
- Drop in one egg, beat well, then add the second and beat again before stirring in the lemon zest and vanilla. The batter should smell aggressively citrusy and wonderful at this stage.
- Fold in flour and milk:
- Add half the flour mixture and fold gently with a spatula, then half the milk, then the remaining flour, then the remaining milk. Stop mixing the moment everything comes together because overworking the batter makes the cake tough.
- Add the rhubarb:
- Toss the diced rhubarb through the batter with a few gentle folds, distributing the pieces without crushing them into pink mush.
- Bake:
- Spoon the batter into the prepared tin, smooth the top, and bake for 45 to 55 minutes until a skewer poked into the center comes out clean. The kitchen will start smelling incredible around the thirty minute mark.
- Make the drizzle:
- While the cake bakes, stir the lemon juice and sugar together in a small bowl until no grittiness remains. A fork and about two minutes of patient stirring should do it.
- Drizzle while hot:
- Pull the cake from the oven and immediately poke it full of holes with a skewer, then pour the lemon syrup slowly and evenly over the entire surface. Watch it disappear into the crumb like magic.
- Cool and finish:
- Leave the cake in its tin for fifteen minutes to absorb the drizzle, then turn it out onto a wire rack to cool completely. Dust with icing sugar and scatter extra zest over the top if you are feeling fancy.
Save There is something about the way rhubarb turns soft and jewel toned inside a cake that makes you feel like you have pulled off a small act of alchemy.
Serving Suggestions Worth Trying
A thick dollop of cold creme fraiche against the warm, sharp crumb is genuinely one of the simplest pleasures I know. Whipped cream works too, but the slight tang of creme fraiche matches the lemon and pulls everything into sharper focus.
Swapping the Fruit
When rhubarb season ends and you are left craving this cake, raspberries step in beautifully, though they release more juice so expect a slightly wetter crumb. Strawberries work too but chop them small and toss them in a pinch of flour first to stop them bleeding pink streaks through the batter.
Storing and Making Ahead
This cake actually improves after a day wrapped tightly in foil, the drizzle settling deeper into every slice. It keeps well at room temperature for three days, though in my experience it rarely gets the chance.
- Freeze individual slices wrapped in foil for up to a month, then thaw at room temperature for a near instant dessert.
- Avoid storing it in the fridge because the cold flattens the flavor and dries out the crumb.
- Always wrap the cut side with cling film to stop the exposed edges from going dry and sad.
Save This is the kind of cake that makes people close their eyes when they take the first bite, and that is really all the reason you need to bake it.
Recipe FAQs
- → Can I use frozen rhubarb instead of fresh?
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Yes, frozen rhubarb works well in this cake. Thaw it completely and drain any excess liquid before folding into the batter to prevent the cake from becoming too dense.
- → How should I store the cake?
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Keep in an airtight container at room temperature for up to 3 days. The lemon drizzle helps keep the cake moist. For longer storage, wrap well and freeze for up to 3 months.
- → Can I make this cake gluten-free?
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Substitute the all-purpose flour with a good quality gluten-free flour blend containing xanthan gum. The texture may be slightly denser but equally delicious.
- → Why is my cake sinking in the middle?
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This can happen if the oven temperature is too low or if the cake is underbaked. Use an oven thermometer to verify accuracy and ensure a skewer comes out clean before removing from the oven.
- → Can I add other fruits to the batter?
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Raspberries or strawberries work beautifully as alternatives to rhubarb, especially in summer. You could also add chopped pistachios for extra texture and flavour.
