Diamond-Layered Mochi (菱餅, Hishimochi)

Ingredients

Equipment Needed

• •Steamer or bamboo seiro, with a tight-fitting lid
• •Heatproof mixing bowls
• •Wooden rice paddle or silicone spatula
• •Small square tray, about 18cm
• •Sharp knife or bench scraper

Instructions

1. 1

   Prepare the tray

   Line a small square tray, about 18cm across, with parchment and dust it lightly with potato starch. Keep the dusting thin. Too much starch dries the surface and dulls the clean color of the layers.

2. 2

   Mix the green layer

   Bloom the yomogi powder with 1 teaspoon hot water until it smells grassy and deep green. Mix 60g shiratamako, 30g joshinko, 25g sugar, 85ml water, and the yomogi into a smooth batter. Yomogi needs a moment with hot water because dry powder left raw in the dough gives specks instead of an even green.

3. 3

   Steam and knead

   Scrape the green batter into a heatproof bowl and steam it over steady heat for 8 to 10 minutes, until it turns from milky to slightly translucent and pulls from the side. Turn it onto a starch-dusted surface and knead with a wet spatula until smooth. The dough is hot, so let the tool work first, then use damp hands when it is safe.

4. 4

   Press the base

   Press the green mochi into the lined tray in an even layer. Damp hands help more than force. If the layer is uneven now, the finished diamonds will tell on you, very politely but quite clearly.

5. 5

   Make the white layer

   Mix 60g shiratamako, 30g joshinko, 25g sugar, and 85ml water until smooth. Steam and knead it the same way, then press it over the green layer while both are still faintly warm. Warm layers join cleanly; cold layers sit apart like strangers.

6. 6

   Make the pink layer

   Mix the final 60g shiratamako, 30g joshinko, 25g sugar, and 85ml water with just enough beni koji or food coloring to make a pale peach-blossom pink. Steam, knead, and press it over the white layer. Keep the color restrained. Hinamatsuri pink is blossom, not theater curtain.

7. 7

   Rest the mochi

   Cover the tray loosely and let the stacked mochi rest at room temperature for 20 to 30 minutes, until cool enough to cut cleanly but still tender. Resting lets the starch settle, so the knife makes a clean face instead of dragging the layers.

8. 8

   Cut diamonds

   Lift the slab from the tray and brush away loose starch. Cut it first into strips, then on the diagonal into diamonds, wiping the knife between cuts. A clean blade keeps the green, white, and pink from smearing into one another. Let the knife do the finishing.

Chef Tips

• •Use yomogi, Japanese mugwort, if you can find it. Spinach will make a green layer, but it won't make hishimochi in the same voice. If yomogi is unavailable, leave the green very plain rather than pretending the flavor is unchanged.
• •Shiratamako gives softness and pull, while joshinko steadies the shape. All glutinous rice flour makes a very stretchy sweet; all joshinko turns firm and dry. The balance is the point.
• •Cut smaller diamonds than you think. Hishimochi is displayed and eaten with restraint, and a little piece shows the three colors better than a heavy one.

Advance Preparation

• •Hishimochi is best the day it is made, while the layers are soft and cleanly colored.
• •It can be wrapped tightly and kept at room temperature for one day. If it firms, cut it into pieces and warm briefly in a dry pan or toaster oven until just tender.

Frequently Asked Questions

Nutrition Information

1 serving (about 50g)