Making Smooth Red Bean Paste
This is a fundamental component for buns and pastries. By controlling the moisture content yourself, you can dictate exactly how firm your filling sits inside your dough.
Patience is your primary ingredient.
The beans need a long soak to soften, and the final reduction requires your full attention to prevent the sugars from scorching at the bottom of the pan.
- Heavy-bottomed saucepan
- Immersion blender or food processor
- Silicone spatula
- Fine-mesh sieve
What goes in.
- 1.5 cupsdried adzuki beans
- 3/4 cupgranulated sugar
- 3 tbspneutral oil or melted lard
- 1/4 tspfine salt
Managing the Sugar
Once the beans are mashed and back in the pan, you must cook off the water slowly. Keep the heat at medium-low and use a silicone spatula to scrape the bottom constantly so the sugar doesn't caramelize or burn.
The method.
Soak the beans
Cover the adzuki beans with at least three inches of water in a bowl. Let them sit for at least 8 hours or overnight.
Boil
Drain the beans and place them in a pot with fresh water covering them by an inch. Bring to a boil, then reduce to a simmer until a bean crushed between your fingers offers no resistance—usually about an hour.
Process
Drain the cooking liquid. Use an immersion blender to process the beans into a paste. If you prefer a refined, silky texture, push the paste through a fine-mesh sieve.
Reduce
Return the paste to the pan over medium-low heat. Stir in the sugar, salt, and fat. Continue stirring until the mixture pulls away from the sides of the pan and holds its own shape on the spatula.
Cool
Transfer to a flat plate to cool completely. The paste will firm up significantly as it loses heat.
Other turns to take.
Chunky Style
Skip the fine-mesh sieve step to retain the structural integrity of the bean skins, providing a more rustic texture.
Salted Version
Add an extra pinch of sea salt at the end to contrast against the sweetness, which helps balance the richness of the beans.
When it doesn't go to plan.
Test for readiness by dropping a small amount of paste into a cold bowl; if it stays in a ball without weeping liquid, it is finished.
Do not walk away during the reduction step; the thick paste can trap steam and bubble aggressively.
Store in the refrigerator for up to five days or freeze in flattened portions for months.
The ones that keep coming up.
Why is my paste grainy?
The beans were likely not soft enough before blending, or you skipped the sieve step. Ensure they are fully cooked to a buttery consistency before processing.
Can I use less sugar?
You can, but sugar acts as a preservative and provides the necessary body for the paste. Reducing it significantly will result in a softer filling that may not hold its shape well.