Tostón Cake with Mango Curd Filling
A layered savory-sweet pastry cake that marries Caribbean tostones (crispy fried green plantain) with delicate pastry layers, bound together with a silky mango curd filling spiked with mascarpone and finished with a honey glaze. The plantain chips provide a unique textural contrast and subtle savory undertone that balances the tropical fruit sweetness.
- Prep
- 45 min
- Cook
- 1 hr
- Wait
- 1 hr 30 min
- Total
- 3 hr 15 min
- Makes
- 1 cake (8 slices)
Steps
Before you start
- Read through the entire recipe; the plantain chips and curd filling must be made ahead
- Bring eggs and mascarpone to room temperature (1–1.5 hours)
- Preheat oven to 350°F (175°C) for baking the cake layers
- Have a kitchen thermometer on hand for monitoring the curd
Fry the Tostón ChipsOven 350°F / 175°C
- Heat vegetable oil in a large heavy-bottomed pot or deep skillet to 350°F (175°C), checking with a deep-fry thermometer.
- Working in batches, carefully add plantain slices to the hot oil—they will sink and then float.
- Fry for 2–3 minutes until golden and crispy, stirring occasionally to ensure even cooking.
- Transfer to paper towels with a slotted spoon and sprinkle with sea salt immediately while hot.
- Spread on a cooling rack to cool completely (about 15 minutes).
- Once cool, gently crush the chips into rough ½- to ¾-inch (12–20 mm) pieces; you should have about 1.5 cups (150 g) of crushed chips.
- Set aside.
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Ready when: Plantain slices are deep golden brown and crispy; oil temperature maintained at 350°F (175°C)
Tip: Do not skip the cooling step—the chips will crisp further as they cool. If they soften, reheat at 325°F (160°C) for 2–3 minutes.
Prepare Dry Ingredients for Cake
- In a medium bowl, whisk together all-purpose flour, baking powder, and fine sea salt.
- Set aside.
- This dry mix will be incorporated into the batter in alternating batches.
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Ready when: Mixture is uniform and no lumps remain
Cream Butter and Sugar
- In the bowl of a stand mixer fitted with the paddle attachment, beat softened unsalted butter and granulated sugar on medium-high speed for 4–5 minutes until the mixture is pale, fluffy, and increased in volume by about half.
- Scrape down the bowl halfway through.
- The texture should resemble fluffy clouds.
- If using a hand mixer, this will take 6–7 minutes.
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Ready when: Mixture is pale yellow, fluffy, and increased in volume; sugar granules are no longer visible
Tip: Do not skip this step—proper creaming incorporates air, giving the cake a tender crumb. If butter is too cold, it won't whip properly.
Add Eggs and Vanilla
- Add the three room-temperature eggs to the creamed butter-sugar mixture one at a time, beating on medium speed for about 30 seconds after each addition.
- After the third egg, add vanilla extract and beat for another 30 seconds.
- Scrape down the bowl between additions to ensure even mixing.
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Ready when: Mixture is pale, fluffy, and homogeneous; no streaks of egg white remain
Tip: If eggs are cold, they may cause the batter to separate or look curdled. Let them sit at room temperature for 1–1.5 hours before mixing.
Alternate Flour and Milk
- Reduce mixer speed to medium-low.
- Add one-third of the dry flour mixture and beat for about 30 seconds until just combined.
- Pour in half the room-temperature milk and beat for 30 seconds.
- Add another third of the flour, beat for 30 seconds, then add the remaining milk and beat for 30 seconds.
- Finally, add the last third of flour and beat until just combined, about 20 seconds.
- Do not overmix.
- The batter should be smooth but not overworked.
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Ready when: Batter is smooth, no flour streaks remain, and no lumps are visible; batter flows slightly when dropped from a spoon
Tip: Overmixing after adding flour develops gluten and toughens the cake. Mix only until streaks disappear.
Fold in Tostón Chips
- Remove the mixer bowl and use a rubber spatula to gently fold the crushed tostón chips into the batter using 8–10 broad, sweeping motions.
- The chips should be evenly distributed throughout without breaking down further.
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Ready when: Tostón chips are evenly distributed throughout batter; no large pockets of chips or batter remain
Tip: Fold gently to preserve the texture of the chips. Vigorous stirring will crush them and reduce their crispness.
Bake Cake LayersOven 350°F / 175°C
- Preheat oven to 350°F (175°C).
- Divide the batter evenly between two 8-inch (20 cm) round cake pans that have been lightly buttered and dusted with flour (or lined with parchment).
- Tap each pan on the counter twice to release air bubbles.
- Bake for 28–32 minutes until a wooden toothpick inserted into the center comes out with only a few moist crumbs and the tops are pale golden brown.
- The cakes should spring back slightly when touched.
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Ready when: Toothpick inserted into center comes out with only a few moist crumbs; tops are pale golden brown; cakes spring back when lightly touched
Tip: Do not open the oven door for the first 20 minutes; check at 28 minutes with a toothpick. All ovens vary, so check at 28 minutes and add a few minutes if needed.
Cool Cake Layers
- Let the cakes cool in their pans for 10 minutes, then invert onto cooling racks and let cool completely, about 30 minutes.
- Once fully cooled, level the tops of each cake with a serrated knife if they have domed significantly (optional but helps with stacking).
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Ready when: Cakes are cool to the touch and firm enough to handle without breaking
Tip: Do not refrigerate yet; the cakes will be easier to work with at room temperature. Leveling is optional but helps achieve even layers.
Make Mango Curd FillingOven 170°F / 75°C
- In a medium saucepan, whisk together mango puree, egg yolks, and caster sugar.
- Place the pan over a medium heat and cook, stirring constantly with a whisk, for 8–10 minutes until the mixture reaches 170°F (77°C) on a kitchen thermometer (this pasteurizes the eggs) and noticeably thickens.
- It should coat the back of a spoon.
- Remove from heat and immediately whisk in the cold butter cubes one at a time, waiting for each piece to fully incorporate before adding the next.
- Stir in fresh lime juice.
- Let cool to room temperature (about 15 minutes), then fold in the room-temperature mascarpone with a spatula using 6–8 gentle strokes until no streaks remain.
- The filling should be smooth, creamy, and spreadable.
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Ready when: Curd reaches 170°F (77°C), coats the back of a spoon, and visibly thickens; after adding butter and mascarpone, filling is smooth and creamy
Tip: Do not rush the cooling; warm curd will make the cake layers collapse. Keep the heat at medium to avoid scrambling the eggs. Constant whisking prevents lumps.
Assemble the Cake
- Place the first cooled cake layer on a 9-inch (23 cm) cake stand or serving plate.
- Spread about three-quarters of the mango curd filling evenly over the top using an offset spatula, leaving a ¼-inch (6 mm) border around the edges.
- Carefully place the second cake layer on top, aligning the edges.
- Spread the remaining curd filling on top and slightly over the edges, creating a rustic finish.
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Ready when: Cake is stacked with filling evenly distributed; no gaps between layers
Tip: If the curd has firmed up too much, let it sit at room temperature for a few minutes to soften slightly. A warm offset spatula helps with spreading.
Apply Honey Glaze and Garnish
- In a small bowl, stir together warmed honey and fresh lime zest.
- Drizzle the warm honey glaze over the top of the cake, allowing it to drip down the sides slightly.
- If using edible flowers, scatter them over the top while the honey is still tacky.
- Refrigerate the assembled cake for at least 30 minutes before serving to allow the filling to set slightly and make slicing cleaner.
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Ready when: Honey is evenly drizzled; edible flowers are distributed across the top; cake feels set when gently touched
Tip: The honey glaze will harden slightly once chilled, providing a glossy finish. If you apply it over cold cake, warm it slightly more to help it drip.
Serve
- Remove the cake from the refrigerator 15 minutes before serving to allow flavors to bloom.
- Slice with a sharp, long-bladed knife dipped in hot water and wiped between cuts.
- Each slice should showcase the tostón chips embedded in the cake and the vibrant mango curd filling.
- Serve at cool room temperature.
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Ready when: Cake is sliced cleanly, showing layers and filling; each slice is intact and attractive
Tip: A hot, wet knife makes clean slices. If the cake is too cold, the plantain chips may shatter when cutting—letting it rest at room temperature helps.
Good to know
Tips
- The tostón chips must cool completely before folding into the batter; warm chips will soften and lose their crispness. If they soften during assembly, reheat them at 325°F (160°C) for 2–3 minutes and cool again.
- Room-temperature eggs and mascarpone are essential. Cold ingredients won't emulsify properly in the curd and may cause the batter to break. Bring them out 1–1.5 hours before you start.
- The mango curd must reach 170°F (77°C) to safely pasteurize the raw eggs. Use a reliable kitchen thermometer and stir constantly to ensure even heating.
- If the cake layers dome too much, level them with a serrated knife for even stacking. Store the dome scraps—they're delicious crumbled and eaten with a spoonful of extra curd.
Make ahead
The tostón chips can be made up to 2 days ahead and stored in an airtight container at room temperature. The mango curd can be made up to 3 days ahead and stored in an airtight container in the refrigerator. The cake layers can be made 1 day ahead, wrapped tightly in plastic wrap, and stored at room temperature. Assemble and glaze the cake no more than 6 hours before serving.
Storage & reheating
Store the whole assembled cake, covered loosely with plastic wrap, in the refrigerator for up to 2 days. The cake is best served chilled or at cool room temperature. To reheat individual slices, let them sit at room temperature for 20 minutes before serving. Do not freeze the assembled cake due to the curd filling's texture sensitivity, but individual components freeze well: wrap cooled cake layers in plastic wrap and freeze for up to 1 month; freeze mango curd in an airtight container for up to 1 month (thaw in the refrigerator overnight).
Substitutions
- fresh mango puree (from ripe mangoes) → passion fruit puree or a blend of passion fruit and mango (1:1 ratio). Passion fruit adds tartness; strain carefully to remove seeds. Use the same volume as mango.
- mascarpone cheese, room temperature → crème fraîche or sour cream. These will add tanginess and slightly reduce richness. Use the same weight but fold in more gently to avoid deflating the curd.
- green plantains, firm and unripe → cassava chips or thinly sliced green banana chips. These provide a similar savory, starchy texture. Fry at the same temperature and salt the same way.
- raw honey → pure maple syrup or agave nectar. Use the same volume and heat gently as with honey. The flavor will shift but the gloss and finish will be similar.
