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Blackberry Poppy Seed Bundt Cake with Lemon Glaze

This blackberry poppy seed cake combines a moist, seed-studded cake with layers of vibrant blackberry‑basil jam and a lightly sweetened mascarpone cream frosting. A thin caramel drip and a crown of late‑summer fruit finish the cake for an elegant, seasonal presentation.

It celebrates late summer flavors, especially blackberry and basil—two ingredients that really shine together. The basil keeps the jam bright and prevents it from becoming overly sweet, while the poppy seed cake offers a tender crumb and a pleasant nutty crunch.

A 45 degree angle view of a layer cake with a caramel drip and a crown of late summer fruit on top. The cake sits on a blue grey ceramic platter on a rustic wooden table with forks, a dark blue linen napkin, and small bowls of poppy seeds and blackberries nearby. There is a warm tan stone background behind the table.

This version was inspired by an eye-catching jam‑filled layer cake I saw from a Seattle cake shop, though I adapted the filling and frosting to suit what I had on hand—mascarpone and a small basil harvest from the garden. I also added a delicate caramel drip and arranged late summer fruit on top for color and texture.

The cake batter is adapted from a beloved poppy seed loaf—poppy seeds are soaked in warm milk to soften their outer shell and coax extra flavor into the batter. The result is a cake that’s moist, tender, and slightly nutty, which contrasts beautifully with the creamy frosting and jam.

The blackberry‑basil jam is straightforward: fresh blackberries are cooked with a touch of sugar and lemon, then blended with fresh basil for an herbal lift. The mascarpone cream frosting is essentially a light, whipped mascarpone and cream mixture flavored with vanilla and a touch of almond extract. When whipped to a thick, stable consistency it spreads cleanly and can be used to pipe a dam to hold the jam between layers.

Finish the cake with a whisper of caramel poured over the top and a crescent of seasonal fruit—figs, plums, pears, blackberries, and blueberries all look beautiful. The decorations are edible and emphasize the cake’s summer character.

A slice of poppyseed cake with mascarpone frosting and caramel drip, with layers of vibrant purple blackberry basil jam. The slice sits on a white speckled ceramic plate with a navy blue linen napkin folded underneath, on a rustic wooden table.

Ingredients

POPPY SEED CAKE

Poppy seeds – The recipe uses 100 g (¾ cup). If the texture is too seedy for you, halve the amount. Soaking the seeds in hot milk softens them and releases more flavor.

Whole milk – warmed to soak the poppy seeds; dairy alternatives can be used if desired.

All‑purpose flour, baking powder, and kosher salt for structure and leavening.

Unsalted butter (room temperature, cubed), granulated sugar, and eggs provide richness, tenderness, and structure.

Vanilla extract, almond extract, and lemon zest round out the flavor profile.

BLACKBERRY BASIL JAM

Fresh blackberries (or thawed frozen) and fresh basil leaves—use fresh basil, not dried. About 14 g (½ ounce or roughly ¾ cup loosely packed) of basil adds an herbal note.

Lemon juice to aid pectin and brighten flavor, and granulated sugar to sweeten and help the jam set. This recipe yields about 1.5 cups of jam and can be refrigerated for up to a month.

MASCARPONE CREAM FROSTING

Mascarpone cheese (chilled) combined with chilled heavy whipping cream, sifted powdered sugar, and a bit of vanilla and almond extract. Whip until thick and stable, taking care not to overmix to avoid graininess.

CARAMEL SAUCE

A classic caramel made from granulated sugar and water, finished with warm heavy cream, unsalted butter, vanilla, and a pinch of kosher salt. A small splash of blackberry liqueur (crème de mûre) is optional for extra fruit depth.

Top view of a cake topped with caramel and a crescent shaped crown of late summer fruit, including figs, blackberries and grapes. A slice of cake has been cut but not removed. The cake sits on a blue grey ceramic platter on a rustic wooden table with forks, a dark blue napkin, and small bowls of poppy seeds and blackberries nearby.

Frequently Asked Questions

What is mascarpone?

Mascarpone is a rich, spreadable Italian cream cheese made from heavy cream and slightly acidified. It has a higher butterfat content than cream cheese, giving it a silky, luxurious mouthfeel. It’s versatile in both sweet and savory dishes.

Can I make this cake with a different jam?

Yes—use about 1 cup of a jam you like. The blackberry‑basil jam is recommended for its bright, balancing flavor, but other jams will work well as a filling.

Why add cake layers upside down?

When torting the cake into thinner layers, place each layer with the crumb side down. This minimizes crumbs on the frosting and makes spreading the mascarpone cream easier.

Do I have to refrigerate this cake?

Because the frosting contains mascarpone and whipped cream, refrigerate the assembled cake if it won’t be served within a couple of hours. Bring the cake to room temperature before serving for the best flavor and texture.

A white frosted layer cake with a caramel drip and a crown of late summer fruit on top. The cake sits on a blue grey ceramic platter on a rustic wooden table with forks and small bowls of poppy seeds and blackberries nearby. The light is coming from behind the cake and makes the caramel on top of the cake shine.
Three slices of blackberry poppy seed cake on white ceramic plates.

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A white frosted blackberry poppy seed layer cake with a caramel drip and a crown of late summer fruit on top. The cake sits on a blue grey ceramic platter on a rustic wooden table with forks and small bowls of poppy seeds and blackberries nearby. There is a warm tan stone background behind the table.

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📖 Recipe

Blackberry Poppy Seed Layer Cake

A poppy seed layer cake filled with blackberry‑basil jam and a lightly sweetened mascarpone cream frosting, finished with a caramel drip and seasonal fruit.
Prep time: 1 hour
Cook time: 24 minutes
Total time: 3 hours
Servings: 12 (6″ cake, 3 layers torted into 6)

INGREDIENTS

POPPY SEED LAYER CAKE

  • 100 g (¾ cup) poppy seeds
  • 250 mL (1 cup) whole milk
  • 240 g (2 cups) all‑purpose flour
  • 2½ tsp baking powder
  • ½ tsp kosher salt
  • 226 g (1 cup) unsalted butter, room temperature, cubed
  • 200 g (1 cup) granulated sugar
  • 3 large eggs, room temperature
  • 2 tsp vanilla extract
  • ½ tsp almond extract
  • Zest of 1 medium lemon

BLACKBERRY BASIL JAM

  • 525 g (3 cups) blackberries, fresh (or thawed frozen)
  • 14 g (½ oz; ~¾ cup loosely packed) fresh basil leaves
  • 1 Tbsp lemon juice
  • 100 g (½ cup) granulated sugar

MASCARPONE CREAM FROSTING

  • 226 g (8 oz, 1 cup) mascarpone cheese, chilled
  • 2 tsp vanilla extract
  • ¼ tsp almond extract
  • 220 g (1 cup) powdered sugar, sifted
  • 250 mL (1 cup) heavy whipping cream, chilled

CARAMEL SAUCE

  • 200 g (1 cup) granulated sugar
  • 60 mL (¼ cup) water
  • 125 mL (½ cup) heavy whipping cream, warm
  • 28 g (2 Tbsp) unsalted butter
  • 1 tsp vanilla extract
  • ½ tsp kosher salt
  • 2 tsp blackberry liqueur (optional)

DECORATION

  • Seasonal fruit such as pears, figs, plums, blackberries, blueberries
  • Basil leaves and other edible floral accents

INSTRUCTIONS

POPPY SEED LAYER CAKE

  1. Preheat oven to 350°F (177°C). Grease three 6″ cake pans and line with parchment circles.
  2. Warm the milk and poppy seeds in a small saucepan until it comes to a boil. Remove from heat and cool.
  3. Whisk together flour, baking powder, and salt; set aside.
  4. Cream butter and sugar in a stand mixer until light. Add eggs one at a time, then vanilla, almond extract, and lemon zest.
  5. Add half the flour mixture and mix until just combined. Add the cooled poppy seed‑milk mixture, then the remaining flour. Scrape the bowl.
  6. Divide batter evenly among pans and bake 23–25 minutes, until the cakes pull away from the sides and a toothpick comes out clean. Cool in pans 10 minutes, then invert onto a rack and cool completely.
  7. When cool, torte each layer in half to make six thin layers.

BLACKBERRY BASIL JAM

  1. Yield: ~1.5 cups. Place half the blackberries in a fine mesh strainer over a bowl and press to extract juice; discard seeds.
  2. Blend the strained juice with basil leaves and lemon juice until smooth.
  3. In a saucepan, combine the remaining blackberries and sugar. Mash and cook over medium, then add the blended mixture. Simmer, stirring, until thickened (about 20–25 minutes). Test on a chilled plate. Cool and refrigerate up to a month.

MASCARPONE CREAM FROSTING

  1. Yield: ~3 cups. In a mixer bowl with the whisk, beat chilled mascarpone with vanilla, almond extract, and powdered sugar on medium until combined. Increase speed and beat briefly until light—do not overmix.
  2. With mixer on high, stream in chilled heavy cream and beat until the mixture is thick, stable, and holds its shape. Stop once stiff consistency is reached.

CARAMEL SAUCE

  1. Yield: about 2 cups. In a heavy saucepan, cook sugar and water over medium without stirring until a light copper color forms. Remove from heat and whisk in warm cream carefully.
  2. Whisk until smooth, then stir in butter, vanilla, and salt. If using, whisk in blackberry liqueur. Cool; refrigerate extra portions airtight.

CAKE ASSEMBLY

  1. Place the first torted layer cut side down on a platter. Spread a thin layer of mascarpone over the layer, then pipe a frosting dam around the edge. Spoon jam into the center. Repeat, alternating layers: two layers with jam and two without, ending with the final layer cut side down.
  2. Cover the top and sides with remaining mascarpone frosting. For a naked finish, apply a thin coat and use a bench scraper to expose bits of cake.
  3. Chill at least 30 minutes before adding the caramel drip. Test the caramel on a practice surface so it drips slowly. Pour caramel on top, nudging small amounts over the edge to form drips. Chill another 30 minutes to set.
  4. Decorate with larger fruits first, then add smaller berries and herbs. Use toothpicks discreetly to support upright fruits if needed. Serve at room temperature for best flavor; refrigerate when storing.

EQUIPMENT

  • Three 6-inch round cake pans
  • Stand mixer with paddle and whisk attachments (or hand mixer)
  • Offset spatula and bench scraper
  • Small saucepan for milk and poppy seeds, and a larger heavy pan for caramel
  • Fine mesh strainer and blender for the jam

NOTES

The poppy seed cake is adapted from a classic poppy seed loaf recipe. Soaking the seeds in hot milk improves texture and flavor. If you prefer less seedy texture, reduce the poppy seeds by half.