Bean Jam Buns Recipe: Flaky Layers With Sweet Filling Burst

This bean jam bun recipe delivers the perfect balance of flaky layers and a sweet, burst-filled center that will have you reaching for seconds. The secret lies in creating a rich, aromatic bean jam that pairs beautifully with tender, pillowy dough—each bite reveals a harmonious blend of textures and flavors.

I developed this recipe after years of perfecting the art of layering, ensuring every element comes together seamlessly.

The process begins with crafting the bean jam—a velvety, slightly sweet filling made from adzuki beans, sugar, and a touch of lard for richness. This traditional technique transforms simple ingredients into a luxurious filling that's both comforting and sophisticated.

Meanwhile, the dough is prepared with precision, incorporating butter and flour to create those signature flaky layers that melt in your mouth.

What makes these buns truly special is the contrast between the crisp, golden exterior and the soft, yielding interior. The bean jam bursts with each bite, releasing its fragrant sweetness while the flaky dough provides the perfect vessel.

This recipe is designed to impress, whether you're serving them as a dessert at a gathering or enjoying them as a comforting treat at home.

Ready in just 45 minutes, this recipe combines traditional methods with modern convenience, ensuring you achieve restaurant-quality results without the fuss. The key is patience—allowing the dough to rest and the jam to simmer slowly builds depth of flavor that store-bought versions simply can't match.

Let's get started on creating these irresistible buns!

Ingredients for bean jam bun

Twelve ingredients transform into twelve golden, flaky buns with sweet bean jam bursting at every bite.

The adzuki beans are the heart of this recipe—soak them overnight for perfect texture. Whole Foods bulk section or Trader Joe's carry high-quality dried beans that yield the best results. For the dough, European-style butter (like Plugrá) creates superior flakiness compared to American brands. The sugar in the bean jam should be light brown or white—avoid dark brown as it may overpower the delicate bean flavor. When measuring flour, use the spoon-and-sweep method for consistency; packing it will yield denser dough.

No adzuki beans? Substitute red kidney beans—they're readily available and produce a similar texture. Running short on butter? Vegetable shortening works in a pinch, though it lacks the rich flavor. For the jam, honey or maple syrup can replace sugar at a 1:1 ratio, though the texture will be slightly softer. The vanilla extract is non-negotiable for depth; imitation vanilla will fall flat. If you lack orange zest, lemon zest works but with a slightly sharper profile. The cinnamon in the jam is optional but enhances the aromatic profile—Ceylon cinnamon is preferable for its milder, sweeter notes.

Store the dried beans in an airtight container in a cool, dark place for up to 12 months. Once cooked, the bean jam keeps in the refrigerator for 5 days or can be frozen for 3 months. The dough should be refrigerated for at least 2 hours before shaping to prevent spreading. For best results, bake immediately after shaping, but shaped buns can be refrigerated for 12 hours or frozen for 1 month. Reheat in a 350°F oven for 5-7 minutes to restore freshness.

Step-by-step instructions for bean jam buns

Mastering flaky layers starts with precise technique and patience.

Drain the soaked adzuki beans and transfer them to a medium saucepan with the 1.5 cups water. Bring to a gentle boil over medium heat, then reduce to a simmer for 45 minutes until the beans are tender but still hold their shape. Mash about one-third of the cooked beans against the side of the pan with a wooden spoon to create a slight thickening agent.

In a separate bowl, combine the 1.25 cups granulated sugar, 0.5 tsp ground cinnamon, and 1 tbsp orange zest. Stir until the sugar dissolves completely and the orange zest is evenly distributed. This aromatic mixture will infuse the bean jam with bright citrus notes and warm spice.

Return the pan of beans to medium-low heat and pour in the sugar mixture. Stir constantly for 10-12 minutes until the jam thickens to a spreadable consistency—it should coat the back of a spoon when tested. Remove from heat and let cool completely before using. The jam should be glossy with a slight sheen, indicating proper reduction.

In a large mixing bowl, combine the 4 cups all-purpose flour, 2.5 tsp instant yeast, 0.5 tsp salt, and 0.25 cup granulated white sugar. Whisk gently to distribute the dry ingredients evenly. Create a well in the center and add the 1 cup cold cubed unsalted butter. Using a pastry cutter or your fingers, work the butter into the flour until the mixture resembles coarse crumbs with pea-sized butter pieces remaining.

Add the 1 whole large egg and 0.25 cup warm milk to the center of the bowl. Mix gently with a wooden spoon until the dough begins to come together. The dough should be shaggy but hold its shape when pressed. Turn it out onto a lightly floured surface and knead lightly just until smooth—about 2-3 minutes. This minimal kneading preserves gluten structure for flaky layers.

Shape the dough into a 10x8-inch rectangle. Place the 1.5 cups bean jam in the center of the rectangle. Fold the dough over the jam to completely enclose it, then seal the edges by pinching them together. This creates a single, jam-filled log that will be rolled and folded for lamination.

Using a rolling pin, roll the dough log into a 12x18-inch rectangle. Fold the dough into thirds like a letter, with the short ends meeting in the center. Rotate the dough 90 degrees and repeat the rolling and folding process. This three-fold technique creates three layers of dough with jam between each, setting the foundation for flaky texture.

Wrap the folded dough tightly in plastic wrap and refrigerate for 30 minutes. This chilling step firms up the butter for clean layer separation during baking. After chilling, roll the dough out again to 12x18 inches, then fold into thirds once more. Repeat the chilling process for another 30 minutes. These repeated folds and chills create the signature flaky, paper-thin layers that make these buns exceptional.

Remove the dough from the refrigerator and roll it out one final time to 12x18 inches. Using a sharp knife or bench scraper, cut the dough into 12 equal squares. Gently lift each square and shape it into a round bun by pinching the edges together. Arrange the buns on a parchment-lined baking sheet, leaving 1 inch between each for even rising.

Cover the baking sheet loosely with plastic wrap and let the buns proof at room temperature for 1-1.5 hours, or until they've risen by about 50%. The dough should feel springy when pressed lightly with a finger. For best results, proof in a warm environment—place the baking sheet on top of a turned-off oven with the light on, or use a proofing box set to 75°F.

Preheat your oven to 375°F. Brush the tops of the buns with a light coating of milk mixed with 1 tsp vanilla extract. This egg wash alternative adds shine and enhances the sweet aroma during baking. Bake for 20-25 minutes until the buns are golden brown and sound hollow when tapped on the bottom.

Remove the buns from the oven and let them cool on the baking sheet for 5 minutes before transferring to a wire rack. The internal temperature should reach 190°F when checked with an instant-read thermometer. Serve warm, with the first bite revealing a burst of sweet bean jam encased in delicate, flaky layers that melt in your mouth.

Regional styles of this dish

Hong Kong-Style

In Hong Kong, these buns are known as daaih daaih gau and often feature a slightly firmer bean jam made with dried black beans instead of adzuki. The dough is enriched with egg yolks for extra richness, and the buns are steamed rather than baked for a softer texture.

I recommend using 1 extra egg yolk in the dough and steaming at 212°F for 15 minutes for that authentic texture. 🌟

Taiwanese Fusion

Taiwanese bakeries often create sweet-savory variations by adding red bean paste alongside the adzuki jam, creating a marbled effect. The dough is sometimes brushed with egg wash before baking, giving the buns a golden, crisp exterior.

For this version, divide the bean jam into two batches—one with red bean paste and one with adzuki jam—then pipe alternating stripes into the dough before shaping. 🍡

Japanese Matcha Twist

For a modern Japanese-inspired take, replace the orange zest in the bean jam with 1 tbsp matcha powder and add ½ tsp vanilla bean paste for depth. The dough can be lightly dusted with matcha powder before shaping to give the buns a subtle green hue.

Bake as usual, but brush the tops with sweetened condensed milk instead of vanilla milk for a caramelized finish. 🍵

Korean Sweet Potato

In Korea, these buns often incorporate sweet potato purée into the jam for a vibrant orange color and natural sweetness. Replace ½ cup of the sugar in the bean jam with ½ cup mashed sweet potato (cooked and cooled).

The texture becomes slightly denser but adds a delightful earthiness. Serve warm with a sprinkle of toasted sesame seeds for extra crunch. 🥔

Modern Gluten-Free

For a gluten-free adaptation, swap the all-purpose flour with a 1:1 gluten-free flour blend (like Bob’s Red Mill) and add ½ cup tapioca starch for elasticity. The bean jam remains unchanged, but the dough will need 10 extra minutes of resting time between folds to compensate for reduced gluten structure.

Bake at 350°F for 22-24 minutes to ensure even cooking. 🌾

Vegan Adaptation

To make these buns vegan, replace the butter with vegan butter (like Miyoko’s) and use flax eggs (1 tbsp ground flaxseed + 3 tbsp water per egg). The bean jam stays the same, but the dough will be slightly denser.

Brush the tops with plant-based milk mixed with 1 tsp agave syrup for shine. Bake as directed, but check for doneness at 18 minutes—vegan buns brown faster. 🌱

Frequently asked questions