Method
Build the red bean layer

Combine 280 g of cooked adzuki beans, 120 ml of water, 50 g of granulated sugar for red beans, and 0.75 g of fine sea salt for red beans in a 3-quart heavy saucepan. Bring to a gentle simmer over medium heat, about 3 to 4 minutes, then lower the heat to medium-low. Cook for 5 to 7 minutes, stirring often and mashing about two-thirds of the beans against the pan, until the mixture forms soft mounds and a spoon dragged through it leaves a trail that slowly closes. If it tightens before the beans soften, add only a small splash of hot water.
5:00 first texture checkSet the hidden layer

Set out four clear heatproof mugs with at least 450 ml (about 15 fl oz) capacity. Divide the warm red bean mixture evenly among them and press it into a level layer about 1.5 cm (1/2 in) deep. Wipe any bean mixture from the upper inside walls of the mugs so the cocoa layer will look clean and distinct.
Whisk the cocoa smooth

Wipe the saucepan clean. Whisk 120 ml of pasteurized 2% milk for cocoa paste, 30 g of unsweetened cocoa powder, 38 g of granulated sugar for cocoa, and 0.75 g of fine sea salt for cocoa in the saucepan until no dry pockets remain. Whisk in 840 ml of pasteurized 2% milk for finishing, then warm over medium-low heat for 6 to 8 minutes, whisking often, until steaming and about 70-75°C (158-167°F); do not let it boil. Remove from the heat and whisk in 5 ml of vanilla extract.
6:00 first heat checkPour the cocoa layer

Hold a teaspoon just above the red bean layer in the first mug and slowly pour the hot cocoa over the back of the spoon to soften the impact. Repeat with the remaining mugs, dividing the cocoa evenly. Serve immediately with teaspoons. Sip without stirring for a clean cocoa layer and a final spoonful of sweet beans, or stir before drinking for an evenly earthy cocoa.
Smart Substitutions
- Using sweetened canned adzuki? Use the same volume, omit the granulated sugar for red beans, and begin with half the water; add more only if the mixture needs loosening.
- Need a dairy-free version? Replace both milk portions with unsweetened soy milk for similar body, noting that soy is a major allergen.
- Prefer a smoother finish? Blend the warm red bean mixture briefly with an immersion blender, stopping before it becomes completely uniform.
- No vanilla extract? Use 1/4 teaspoon ground cinnamon in the cocoa for a warm accent that does not hide the adzuki flavor.
Tips and Variations
- Use clear heatproof mugs when you want the burgundy bean layer to stay visible beneath the cocoa.
- Keep the cocoa below a boil; steady medium-low heat gives it a smoother texture and cleaner milk flavor.
- Pour over the back of a teaspoon close to the bean layer so the cocoa lands gently instead of tunneling through it.
What Went Wrong?
- The cocoa is lumpy Take the pan off the heat and whisk firmly until smooth, then return it to medium-low heat.
- The bean layer is watery Simmer it for another minute or two, stirring, until a spoon trail slowly closes.
- The layers mix right away Let the bean base thicken slightly and pour the cocoa more slowly over the back of a spoon.
- The cocoa tastes flat Check that both measured salt portions and the vanilla were added; they sharpen the cocoa and round out the beans.
Nutrition Estimate
- Fiber: 8 g per serving
- Sodium: 270 mg per serving
Nutrition disclaimer:This recipe is provided for general cooking information only. Nutrition values are estimates and may vary by ingredients, brands, preparation methods, and serving sizes. Check ingredient labels and follow appropriate food-safety practices. This content is not medical, dietary, allergy, or professional food-safety advice.
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