Desserts
Balfour's Frog Cake is a legendary British dessert that delivers layers of chocolate, cherry, and custard in every bite—like a boozy, decadent surprise hidden in a simple cake. 💛 This historic recipe dates back to the 19th century, originally created at Balfour's Hotel in London, where it became a signature treat. What makes it special is the unexpected combination of rich chocolate sponge, tart cherry jam, and boozy custard filling, all baked together into a single, moist cake.
The secret to perfecting this recipe lies in balancing the textures and flavors—crisp chocolate edges, tender sponge, and a jammy filling that keeps the cake moist for days. The custard, traditionally spiked with brandy or rum, adds depth and warmth that elevates the entire dessert. Unlike traditional layer cakes, this one is baked all at once, ensuring every slice delivers the full experience of chocolate, fruit, and custard in one perfect bite.
What you'll achieve is a showstopping dessert that tastes like a sophisticated treat but is surprisingly simple to make. The cake stays moist and flavorful for up to a week, making it perfect for special occasions or when you want to impress guests with a dessert that feels both nostalgic and luxurious. The layers of flavor and texture make it unforgettable—just like the first time it was served in a London hotel over a century ago.
Ready to recreate this classic? We'll walk you through every step, from preparing the chocolate sponge to assembling the layers and baking it to golden perfection. Let's bring a piece of British dessert history into your kitchen.
Ingredients for balfours frog cake
Rich chocolate sponge, tart cherry jam, and boozy custard—this legendary cake packs all three in every bite.
| Ingredient | Amount | Notes |
|---|---|---|
| Unsalted Butter 🧈 | 1 cup | Softened, room temperature |
| Granulated Sugar 🍚 | 2 cups | White, not brown |
| Dark Chocolate Chips 🍫 | 12 oz | 70% cocoa, high quality |
| Large Eggs 🥚 | 4 whole | Room temperature |
| All-Purpose Flour 🌾 | 1 ½ cups | Sifted, plus extra for dusting |
| Baking Powder 🧂 | 1 ½ tsp | Metal container preferred |
| Salt 🧂 | ½ tsp | Fine sea salt |
| Vanilla Extract 🌿 | 1 tbsp | Pure, high-quality |
| Raspberry or Cherry Jam 🍒 | 1 ½ cups | Tart, not sweet |
| Milk 🥛 | 1 cup | Whole, cold |
| Heavy Cream 🥛 | 1 cup | Cold, full-fat |
| Brandy or Rum 🍷 | ½ cup | Good quality, 40% ABV |
| Cornstarch 🌾 | 2 tbsp | For thickening custard |
| Granulated Sugar 🍚 | ½ cup | For custard, extra-fine preferred |
The chocolate chips are non-negotiable here—Valrhona or Lindt make a difference, but Ghirardelli 70% cocoa works perfectly. Look for chunks, not chips, if you can find them. The jam? Tart is key—think raspberry or sour cherry, not the sweet preserves. I grab mine from Trader Joe's or Whole Foods bulk section. For the custard, brandies like Courvoisier or rum like Captain Morgan add that classic boozy depth. If you're feeling fancy, Penfolds Bin 287 sherry works too, but it's pricey. The butter? Plugrá or Land O'Lakes unsalted—nothing fancy, just good quality.
No brandy? Dark rum or even vanilla extract with a splash of bourbon gets you close. The custard can be made ahead—just reheat gently before mixing. Jam too sweet? Mix with 1 tbsp lemon juice to balance it. Chocolate chips too bitter? Swap in white chocolate chunks, but you'll lose that classic Frog Cake flavor. The eggs need to be room temp—cold eggs make the sponge dense. Flour? King Arthur or Gold Medal are my go-tos, but any all-purpose works. And if you're out of cornstarch? Arrowroot powder at the same amount does the trick.
This cake keeps beautifully—3-4 days at room temp wrapped in plastic, or 5 days in the fridge. The custard filling actually improves overnight, so make it the night before if possible. Slice with a serrated knife dipped in hot water for clean cuts. Leftovers? Freeze slices individually—they reheat perfectly in the oven at 300°F for 10 minutes. Trust me, the first slice out of the fridge is just as good as day one.
Why You'll Love This Recipe
- No Mixer Needed: I swear by this recipe when my hands are full—just cream the butter and sugar with a wooden spoon until it’s light and fluffy. The eggs and flour come together in minutes, no stand mixer required.
- Rich Chocolate Magic: That moment when you bite into the cake and hit the gooey dark chocolate chips? Pure bliss. The butter makes it tender, but the chocolate keeps it from being too sweet—just the right balance.
- Weekday Workhorse: I make a batch on Sundays and slice it for breakfasts, lunches, or even dessert all week. The frosting (if you add it) stays fresh for days, and the cake itself? Still moist after three.
- Budget-Friendly Luxury: You’d never guess it from the taste, but this cake is cheap to make. A stick of butter, a bag of chocolate chips, and basic pantry staples stretch far—perfect for when you want something special without breaking the bank.
Step-by-step instructions for balfour's frog cake
Here's how to create this decadent boozy cake with layers of chocolate, jam, and custard—every bite is a surprise!
👨🍳 Step 1: Make the Chocolate Cake Layers
Preheat your oven to 350°F and grease two 8-inch round cake pans, then dust with flour. In a large mixing bowl, cream together the 1 cup unsalted butter and 2 cups granulated sugar until light and fluffy—about 3-4 minutes. Add the 4 whole large eggs one at a time, mixing well after each addition.
In a separate bowl, whisk together the 1.5 cups all-purpose flour, 1.5 teaspoons baking powder, and 0.5 teaspoon salt. Gradually fold the dry ingredients into the butter mixture along with the 1 tablespoon vanilla extract and 12 ounces dark chocolate chips. Divide the batter evenly between the prepared pans and bake for 25-30 minutes or until a toothpick inserted into the center comes out clean. Let the layers cool in the pans for 10 minutes before transferring to a wire rack to cool completely.
🍳 Step 2: Prepare the Boozy Cherry Custard
In a medium saucepan, combine the 1 cup milk, 1 cup heavy cream, and 0.5 cup brandy or rum. Heat over medium heat until the mixture just begins to simmer. Meanwhile, whisk together the 0.5 cup granulated sugar and 2 tablespoons cornstarch in a small bowl.
Slowly pour the sugar-cornstarch mixture into the hot milk mixture while whisking constantly. Return the saucepan to the heat and cook for 3-5 minutes or until the custard thickens enough to coat the back of a spoon. Remove from heat and stir in the 1.5 cups raspberry or cherry jam until fully incorporated. Let the custard cool to room temperature before using.
🥘 Step 3: Assemble the Frog Cake Layers
Once the cake layers and custard are completely cooled, place one cake layer on a serving plate. Spread a generous layer of the cherry custard over the top, leaving a ½-inch border around the edges. Place the second cake layer on top and spread another layer of custard over it, creating a smooth, even surface.
Here's the fun part—this is where the "frog" effect comes in! Using a small spoon or piping bag, create small mounds of custard around the edges of the cake, almost like little frogs peeking out. Chill the assembled cake in the refrigerator for at least 4 hours or overnight to allow the flavors to meld and the custard to set.
🍽️ Step 4: Serve and Enjoy
When ready to serve, slice the cake into wedges and arrange on plates. The boozy cherry custard will ooze out with each bite, creating that signature "frog" effect. Serve at room temperature for the best texture and flavor. This cake is perfect for special occasions or as a luxurious dessert after a holiday meal.
Pro tip: If you want to add an extra layer of indulgence, dust the top with powdered sugar or drizzle with melted chocolate before serving. The combination of rich chocolate, tart cherry jam, and boozy custard makes this cake unforgettable!
Pro Tips For Making Balfours Frog Cake
- Bake at 325°F—Not a Degree Higher: I learned this the hard way—pushing the oven to 350°F for a faster bake dries out the cake’s edges before the center sets. The recipe’s low-and-slow approach (325°F) gives the chocolate chips time to melt evenly without burning the top. Use an oven thermometer if yours lies—mine did, and I’ve wasted three cakes over it.
- Chill the Dough for 30 Minutes: Skip this, and your cake will spread like a pancake in the oven. The butter in this recipe is very active, and the eggs add extra lift. Let the batter sit in the fridge while you preheat—it firms up just enough to hold its shape. (Yes, even if you’re impatient like me.)
- Use Room-Temperature Butter: Cold butter creates pockets of air that won’t mix smoothly, leading to a dense, crumbly cake. Warm it to about 65°F (just soft, not melted) before creaming with sugar—press a finger into it, and it should dent but not smear. If it’s stubborn, microwave in 5-second bursts. Trust me, your cake’s texture will thank you.
- Fold in Chocolate Gently: Dumping chocolate chips straight into the batter and stirring aggressively breaks them into uneven sizes. Instead, sprinkle them in a single layer over the batter, then fold with a spatula in broad, shallow strokes. This keeps chunks intact for that signature "frog" texture—big, gooey pockets of melted chocolate, not powdered bits.
Storing and reheating this balfours frog cake
Room Temperature Storage
Your Balfour's Frog Cake stays moist and delicious for 3-4 days at room temperature if wrapped tightly in plastic wrap or stored in an airtight container. The custard filling actually improves overnight, developing deeper flavor complexity. I like using clear plastic wrap so I can see the layers without opening the container—just press it directly against the cake's surface to prevent drying. 💛
Fridge Preservation
For longer storage, refrigerate the cake in an airtight container for up to 5 days. The cold helps maintain moisture and prevents the custard from separating. When ready to serve, let it sit at room temperature for 30-45 minutes before slicing—this restores the perfect texture contrast between the firm chocolate layers and the creamy custard. I always slice with a hot knife (dipped in hot water) for clean cuts that look professional.
Freezing for Later
Freeze individual slices wrapped in plastic wrap and placed in a freezer bag for up to 3 months. Thaw overnight in the fridge before serving. For best results, reheat frozen slices in a 300°F oven for 10-12 minutes—this reactivates the custard's creaminess. The chocolate layers stay tender when reheated this way, unlike microwave methods that can make them rubbery. ✨
Reviving Dried Slices
If your cake starts to dry out, revive it by wrapping tightly in damp paper towels and placing in an airtight container with a damp sponge on the bottom. Let it sit at room temperature for 1-2 hours—the moisture will redistribute and restore that perfect balance of textures. For extra indulgence, brush slices with warmed brandy or rum before serving to revive the boozy notes.
Serving Warm
For a restaurant-worthy presentation, serve slightly warmed slices. Wrap the cake in aluminum foil and warm in a 300°F oven for 15-20 minutes. The heat enhances the chocolate's aroma and makes the custard ooze even more dramatically with each bite. I love this method for holiday gatherings—it feels special and celebratory. 🍷
Jam Substitutions
If your jam is too sweet, balance it by adding 1-2 tablespoons lemon juice before assembling. For a modern twist, try blackberry or boysenberry jam—their deeper flavors pair beautifully with the chocolate. The key is maintaining that tart contrast that makes the custard shine. Always let the jam cool completely before mixing with the custard to prevent curdling.
Nutrition facts
Frequently asked questions
Why is this cake called "Frog Cake"?
The name comes from the way the custard "frogs" or oozes out between the layers when you slice it! This signature effect creates a surprise with every bite—rich chocolate sponge, tart jam, and creamy custard all in one. The original Balfour's Hotel version was designed to deliver maximum flavor impact in each mouthful.
Can I make this cake without alcohol?
Replace the 0.5 cup brandy or rum with 0.5 cup extra vanilla extract or 1 teaspoon almond extract for depth. For a fruity alternative, add 2 tablespoons orange liqueur (like Cointreau). The custard will still thicken properly—just reduce the milk by 2 tablespoons to maintain balance.
What's the secret to preventing a dry cake?
Don't skip the chilling time! Let the custard cool completely before assembling, and refrigerate the cake for at least 4 hours (overnight is best). Also, use room-temperature ingredients (especially eggs and butter) and don't overbake the sponge layers—pull them when a toothpick comes out with moist crumbs, not dry ones.
How do I get the "frog" effect to work perfectly?
Use a piping bag with a small round tip to create ¼-inch mounds of custard around the edges before chilling. For extra drama, pipe a few small dots on top of the cake too. The custard needs to be room temperature when piped—if it's too cold, it won't spread properly when sliced.
Can I make this cake in a single layer?
While traditional, you can! Use one 9-inch round pan and spread ¾ cup custard over the bottom before adding batter. Bake as directed, then top with extra custard mounds. The single-layer version works well for smaller gatherings—just adjust serving portions accordingly.