Yokan and Nerikiri: The Refined Architecture of Japanese Confectionery Paste Work

Ingredients

• For the neri-yokan
• 300 g adzuki bean paste (koshian), smooth, shop-bought or home-cooked and sieved
• 4 g agar-agar powder, at 1:0.7 agar ratio to water as per neri-yokan standard
• 280 ml water
• 150 g sugar, white caster; adjusted so adzuki flavour remains distinct
• For matcha yokan variation
• 2 tsp ceremonial-grade matcha, dissolved in a small amount of boiling water before incorporation — do not add powder directly
• For the nerikiri
• 350 g shiro-an (white bean paste), passed twice through a fine drum sieve (uragoshi) after cooking, before use
• 150 g gyuhi (soft pounded mochi dough), at 7:3 shiro-an to gyuhi ratio for optimal plasticity
• natural pigments as required, butterfly pea flower for blue; matcha for green; safflower for pink-red; gardenia for yellow

Method

1. 1
   YOKAN — Combine agar-agar powder with the measured water in a saucepan. Bring to the boil over medium heat, stirring until the agar dissolves completely. Add sugar and stir until fully dissolved. The liquid should be clear and smooth with no visible granules.
2. 2
   Add the adzuki paste in portions, stirring constantly over low heat until fully incorporated and the mixture is homogeneous. For matcha yokan, stir in the pre-dissolved matcha paste at this stage. This is where the dish lives or dies: the sweetness must be present but not dominant — taste the mixture and confirm that the adzuki's own flavour is distinct through the sugar; a cloying result cannot be corrected after setting.
3. 3
   Pour the mixture into a lightly wetted rectangular mould or loaf tin. Smooth the surface. Allow to cool and set fully at room temperature before moving to the refrigerator. The surface should be firm and non-tacky to a light touch, and the block should hold a clean indent without collapsing.
4. 4
   Once fully set, unmould and slice with a single clean stroke of a wet knife — do not saw. Each slice should show a perfectly smooth surface and a clean, unbroken cross-section with no edge collapse.
5. 5
   NERIKIRI — Combine the twice-sieved shiro-an with the gyuhi at a 7:3 ratio, working the two together until a uniform, plastic paste forms. The paste is ready when it holds a shape cleanly without sticking to the hand and stretches slightly without tearing.
6. 6
   Divide the paste into portions according to the number of colours required by the seasonal motif. Work each natural pigment into its portion from the outside in, using gloved hands. For gradient effects, tint sectors of a single ball differently before forming. Work quickly: each finished piece should be completed in under 5 minutes. The paste is ready to shape when it accepts the pigment evenly and the surface remains smooth and matte.
7. 7
   Shape each portion into the chosen seasonal motif using metal shapers, bamboo combs, and cloth as appropriate. The motif must correspond precisely to the current seasonal moment. Do not overwork — excess handling raises the paste temperature and causes stickiness; rest portions briefly if resistance is felt. The finished piece should hold its form without slumping and carry a dry, fine surface with no cracks.