Cha soba is a Japanese noodle that blends buckwheat flour with powdered green tea, giving it a delicate herbal aroma and a subtle jade hue. Served ice cold with a savory soy-mirin dipping broth and crisp fresh toppings, it is the ultimate refreshing summer bowl. Each bite balances earthy buckwheat, grassy tea, salty umami, and a whisper of sweetness.
Prep Time15 mins
Cook Time10 mins
Total Time25 mins
Servings4
Yield4 servings
Nutrition Facts
Per serving (estimated)
- 420 kcalCalories
- 12 gFat
- 2.5 gSaturated Fat
- 65 gCarbs
- 5 gFiber
- 9 gSugar
- 18 gProtein
- 980 mgSodium
- 320 mgPotassium
- 90 mgCalcium
- 3.5 mgIron
- 6 mgVitamin C
- 180 mcgVitamin A
Ingredients
For the Noodles
- 4 bundles (about 14 oz total) dried cha soba (green tea buckwheat noodles)
- 8 cups cold water, for the ice bath
- 1 tray ice cubes
For the Dipping Broth
- 1 cup cold dashi stock (kombu and bonito based)
- 1/2 cup Japanese soy sauce
- 1/3 cup mirin
- 2 tbsp granulated sugar
- 1 tbsp rice vinegar
- 1 tsp toasted sesame oil
For the Toppings
- 2 large eggs, soft boiled and halved
- 2 sheets nori seaweed, thinly shredded
- 3 green onions, finely sliced on the diagonal
- 1/3 cup grated daikon radish, lightly squeezed
- 2 tbsp toasted white sesame seeds
- 1 tsp prepared wasabi, optional
- 1 tsp grated fresh ginger, optional
Directions
- Bring a large pot of unsalted water to a rolling boil. Add the cha soba noodles and stir gently so they do not stick together; cook for 4 to 5 minutes until just tender but still springy, following package timing as a guide.
- While the noodles cook, prepare an ice bath by combining the 8 cups cold water and ice cubes in a large bowl. Drain the cooked noodles in a colander and immediately plunge them into the ice bath, swishing with your hands to remove surface starch and stop the cooking.
- Whisk together the dashi, soy sauce, mirin, sugar, rice vinegar, and sesame oil in a pitcher until the sugar fully dissolves. Chill the broth in the refrigerator for at least 10 minutes so it is thoroughly cold.
- Drain the noodles from the ice bath, gently pat dry, and divide them into 4 shallow individual bowls or bamboo trays. Lightly gather each portion into a neat nest.
- Arrange the toppings over or alongside the noodles: place a halved soft boiled egg at the edge, scatter shredded nori, sliced green onions, grated daikon, and a generous pinch of sesame seeds on top.
- Serve each bowl with a small pitcher or cup of the chilled dipping broth on the side. Diners dip the noodles into the broth with chopsticks, topping each bite with daikon, scallion, and a dab of wasabi if desired.
- Refresh any leftover noodles by rinsing under cold water and returning to the ice bath; the dipping broth will keep, covered, in the refrigerator for up to 3 days.
Cook’s Notes
- True cha soba contains a percentage of wheat flour; for a 100 percent buckwheat version look for juwari soba blended with matcha powder.
- Always shock the noodles in ice water to lock in the bright green tea color and prevent a gummy texture.
- Add 1 tablespoon of yuzu juice to the dipping broth for a bright citrus lift that pairs beautifully with the green tea.
- For a heartier meal, top with chilled poached chicken, shrimp, or blanched edamame in addition to the egg.
- If dashi is unavailable, substitute 1 cup cold water with 1 teaspoon kombu powder and 1 teaspoon bonito powder, stirred and strained.










