This rhubarb and strawberry upside down cake is a sweet spring treat bursting with fresh fruit flavor. The tangy rhubarb pairs perfectly with juicy strawberries, caramelized on top of a moist, buttery cake. Ideal for afternoon tea or a light dessert!
Introduction
I first made this fresh rhubarb and strawberry upside down cake a few springs ago when rhubarb was just starting to appear at the farmer’s market. I’d always loved upside down cakes but wanted to try something a bit lighter and more seasonal than the usual pineapple version. The tartness of the rhubarb combined with the natural sweetness of fresh strawberries creates a wonderful balance that feels like spring in every bite. What makes this cake special is the way the fruit caramelizes on the bottom of the pan (which becomes the top once flipped), giving it a glossy, jammy finish that’s irresistible. I also add a bit of sour cream to the batter to keep the crumb tender and moist without being heavy. It’s perfect for a weekend afternoon with a cup of tea or as a light dessert after dinner. Honestly, my first attempt was a bit too runny because I didn’t chop the rhubarb small enough, so I learned to keep the pieces uniform for even cooking. The final cake is beautifully golden with a vibrant fruit topping that always gets compliments. I hope you enjoy making and eating it as much as I do!
What You'll Need
One 9-inch cake, 8 servings
- 4 cups fresh rhubarb, chopped into 1-inch pieces
- 2 cups fresh strawberries, hulled and halved
- 1/2 cup unsalted butter, melted
- 3/4 cup brown sugar, packed
- 1 1/2 cups all-purpose flour
- 1 teaspoon baking powder
- 1/2 teaspoon baking soda
- 1/4 teaspoon salt
- 3/4 cup granulated sugar
- 2 large eggs
- 1 teaspoon vanilla extract
- 1/2 cup sour cream
- 1/4 cup milk
How To Do It
Step 1
Preheat your oven to 350°F (175°C). Start by preparing the fruit topping: toss the chopped rhubarb and halved strawberries with the brown sugar in a bowl until evenly coated. This step is crucial because the sugar helps draw out the juices and creates that luscious caramelized layer. Spread the melted butter evenly in the bottom of a 9-inch round cake pan, then pour the sugared fruit mixture over the butter, spreading it out in an even layer. Be careful not to overcrowd the pan; the fruit needs room to caramelize properly without steaming.
⏱ Time: 10 minutes
✓ Doneness: Fruit looks glossy and evenly coated with sugar and butter mixture
Step 2
In a separate bowl, whisk together the flour, baking powder, baking soda, and salt. In another large bowl, beat the granulated sugar and eggs until pale and fluffy, about 3-4 minutes. Add the vanilla extract, sour cream, and milk, mixing until smooth. Gradually fold the dry ingredients into the wet until just combined — don’t overmix or the cake will be tough. Pour the batter gently over the fruit in the pan, smoothing the top with a spatula. This layering is what gives the cake its signature upside down look and moist crumb.
⏱ Time: 10 minutes
✓ Doneness: Batter is smooth with no flour streaks, evenly spread over fruit
Step 3
Bake the cake in the preheated oven for 35-40 minutes until the top is golden and a toothpick inserted into the center comes out clean. The baking time can vary depending on your oven, so start checking at 30 minutes. Avoid opening the oven door too often to keep the temperature steady. The cake is done when it springs back gently to the touch and the fruit topping is bubbly and caramelized around the edges.
⏱ Time: 35-40 minutes
✓ Doneness: Golden top, toothpick comes out clean, fruit caramelized and bubbly
Step 4
Let the cake cool in the pan on a wire rack for about 15 minutes before flipping. This resting time allows the caramel to set slightly so it doesn’t run off when inverted. To flip, run a butter knife around the edges to loosen the cake, then place a serving plate over the pan and carefully invert it in one smooth motion. If the cake sticks, give it a gentle shake or tap to release. The fruit topping should now be beautifully displayed on top, glossy and fragrant.
⏱ Time: 15 minutes
✓ Doneness: Cake releases easily from pan, fruit topping intact and shiny
Step 5
Once flipped, let the cake cool completely before slicing. This helps the caramelized fruit set and prevents it from sliding off. The cake will be moist with a tender crumb and a slightly tangy, sweet fruit topping. Serve it as is or with a dollop of whipped cream or vanilla ice cream for an extra indulgent treat. This cake also keeps well for a day or two, making it a great make-ahead dessert.
⏱ Time: 30 minutes
✓ Doneness: Cake is cool to touch, fruit topping firm but still glossy
Step 6
If you want to add an extra layer of flavor, sprinkle some finely chopped toasted almonds or pistachios over the fruit before pouring the batter. This adds a nice crunch and nutty contrast to the soft cake and juicy fruit. Just be sure to press the nuts lightly into the fruit to help them stick during baking.
⏱ Time: 5 minutes
✓ Doneness: Nuts evenly distributed and slightly embedded in fruit layer
Step 7
For an even richer flavor, you can swap half the granulated sugar in the batter for light brown sugar. This will add a subtle caramel note that complements the rhubarb and strawberries beautifully. Just be mindful that this may slightly darken the cake’s crumb and increase moisture, so watch baking times closely.
⏱ Time: 2 minutes
✓ Doneness: Batter has a golden hue and slightly thicker texture
Step 8
If using frozen strawberries or rhubarb, thaw and drain them well before mixing with sugar to avoid excess moisture that can make the cake soggy. Pat the fruit dry with paper towels and reduce the sugar slightly since frozen fruit tends to be sweeter. This adjustment keeps the topping from becoming too watery.
⏱ Time: 10 minutes prep
✓ Doneness: Fruit feels dry to the touch, sugar evenly coats pieces
Step 9
When slicing the cake, use a serrated knife and cut gently with a sawing motion to keep the fruit topping intact. Wiping the knife clean between cuts helps create neat slices and prevents the caramelized fruit from sticking. Serve slices warm or at room temperature for best texture and flavor.
⏱ Time: 5 minutes
✓ Doneness: Slices hold shape with visible fruit topping
Pro Tips
Chop rhubarb into uniform pieces about 1 inch long.
Uniform pieces cook evenly and prevent some bits from being overly tart or undercooked. Uneven sizes can cause inconsistent texture and flavor, affecting the cake’s overall balance.
Use fresh fruit instead of canned or frozen when possible.
Fresh fruit retains its structure better during baking and provides a brighter, fresher flavor. Frozen fruit can release excess moisture, making the topping soggy.
Let the cake cool before flipping it out of the pan.
Cooling allows the caramelized topping to set slightly, preventing it from running off and ensuring a neat presentation.
Don’t overmix the batter when combining wet and dry ingredients.
Overmixing develops gluten, leading to a tough cake. Mixing just until combined keeps the crumb tender and soft.
Use a serrated knife to slice the cake gently.
A serrated knife cuts through the delicate fruit topping without squashing it, preserving the cake’s beautiful appearance.
Press the fruit firmly into the melted butter and sugar before pouring the batter.
This helps the fruit stay in place during baking and promotes even caramelization for a glossy topping.
Add a splash of milk if the batter feels too thick.
A slightly thinner batter allows it to spread evenly over the fruit, ensuring consistent baking and texture.
Common Mistakes to Avoid
Using unevenly chopped rhubarb pieces
Why it happens It’s easy to underestimate how uneven sizes affect cooking time and texture.
Fix Take the time to cut rhubarb into consistent 1-inch pieces to ensure even cooking and avoid overly tart or tough bites.
Not letting the cake cool before flipping
Why it happens Impatience or unfamiliarity with upside down cakes leads to flipping too soon.
Fix Allow the cake to rest 15 minutes so the caramel sets, preventing the topping from sliding off.
Overmixing the batter
Why it happens Trying to fully incorporate ingredients quickly can lead to overmixing.
Fix Mix just until no dry flour remains; this keeps the cake tender and avoids a dense texture.
Using frozen fruit without draining
Why it happens Frozen fruit is convenient but often too wet when added directly.
Fix Thaw and pat dry frozen fruit to reduce excess moisture and prevent a soggy topping.
Skipping the butter layer in the pan
Why it happens Some may try to skip this step to save time or calories.
Fix Melted butter is essential for caramelizing the sugar and fruit; don’t omit it to achieve the signature glossy topping.
Variations
Add a hint of ginger
Stir in 1 teaspoon of freshly grated ginger into the fruit mixture for a warm, spicy note that complements the rhubarb and strawberry. This adds complexity and a subtle zing to the cake.
Note: Grated ginger releases oils that meld with the caramel during baking, so evenly mix it with the fruit for consistent flavor.
Use mixed berries instead of strawberries
Swap strawberries for a mix of blueberries, raspberries, and blackberries to create a colorful, berry-filled upside down cake. This variation offers a deeper berry flavor and a vibrant look.
Note: Mixed berries release more juice, so reduce brown sugar slightly to prevent excess moisture.
Gluten-free version
Replace all-purpose flour with a gluten-free baking blend and add 1/4 teaspoon xanthan gum if not included. This makes the cake accessible to gluten-sensitive eaters while maintaining texture.
Note: Gluten-free batters tend to be more delicate; handle gently and avoid overbaking to keep moistness.
Add toasted nuts on top
Sprinkle chopped toasted almonds or pecans over the fruit before adding the batter for a crunchy texture contrast and nutty flavor that pairs well with the fruit’s sweetness.
Note: Press nuts gently into the fruit layer to prevent them from falling off after baking.
Make mini upside down cakes
Divide the fruit and batter into muffin tins to create individual-sized upside down cakes. Perfect for parties or portion control with the same great flavor.
Note: Reduce baking time to 20-25 minutes and check doneness earlier to avoid overbaking.
Nutrition
Per Serving:
Nutritional values are estimates and may vary based on specific ingredients used.
Storage & Tips
Room Temperature
Store the cake covered loosely with foil or a cake dome at room temperature for up to 2 days. Keep it away from direct sunlight or heat sources to prevent the caramel topping from melting or becoming sticky.
Refrigerator
Keep the cake in an airtight container in the fridge for up to 4 days. The cake may firm up and the topping can become less glossy but the flavor remains delicious. Bring to room temperature or warm slightly before serving.
Freezer
Wrap the cake tightly in plastic wrap and then foil to freeze for up to 2 months. Thaw overnight in the refrigerator and warm gently in the oven to restore texture and bring back the caramel shine.
Reheating
Reheat slices in a 325°F oven for 8-10 minutes to warm through without drying out. Avoid microwaving as it can make the fruit topping watery. A light brush of melted butter before warming can refresh the cake’s moisture.
Make Ahead
Prepare the fruit topping and batter separately a day ahead. Store the fruit mixture covered in the fridge and the batter in an airtight container. Assemble and bake on the day you want to serve for the freshest results.
FAQ
Can I use frozen rhubarb and strawberries for this cake?
Yes, but you should thaw and drain them thoroughly to remove excess moisture. Frozen fruit releases more water, which can make the topping soggy if not dried properly. Pat the fruit dry with paper towels before mixing with the sugar.
What can I substitute for sour cream in the batter?
Plain yogurt or buttermilk are good substitutes for sour cream and will maintain the cake’s moist texture and slight tang. Avoid using low-fat versions as they can dry out the cake or change the flavor balance.
How do I prevent the fruit from sticking to the pan when flipping?
Make sure to melt the butter evenly in the pan before adding the sugar and fruit. After baking, let the cake cool for at least 15 minutes to let the caramel set. Running a knife around the edges before flipping also helps release the cake cleanly.
Can I make this cake gluten-free?
Absolutely! Use a gluten-free all-purpose flour blend that includes xanthan gum or add it separately. Be gentle when mixing and watch baking times as gluten-free cakes can dry out faster.
Why is my cake dense instead of light and fluffy?
Overmixing the batter develops gluten, which makes the cake dense. Also, make sure your baking powder and soda are fresh for proper rise. Mix just until combined and avoid heavy stirring.
How do I store leftover cake to keep it fresh?
Store leftovers in an airtight container at room temperature for up to 2 days or refrigerate for up to 4 days. Bring to room temperature or warm slightly before serving to revive texture and flavor.
Can I add other fruits to the topping?
Yes, berries like blueberries or raspberries work well. Just adjust sugar slightly if using very sweet fruit and ensure fruit pieces are similar in size for even cooking.
What’s the best way to slice this cake neatly?
Use a serrated knife and slice gently with a sawing motion. Wiping the knife clean between cuts prevents sticky fruit from tearing the slices, keeping them neat and presentable.
Final Thoughts
I hope you give this fresh rhubarb and strawberry upside down cake a try this spring! It’s a lovely way to enjoy seasonal fruit and impress your friends. Let me know how it turns out!
