Hiyashi Soba (冷やしそば)

Chilled Buckwheat Noodles with Summer Topping

Introduction

Hiyashi soba is the more decorative cousin of zaru soba, served cold with a colorful array of toppings. It’s a light yet nourishing dish often enjoyed in Japan and Okinawa during warmer months, but its beauty lies in its adaptability—offering cooling refreshment, digestive ease, and vibrant seasonal expression.

In Okinawa, while soba usually refers to the wheat-based Okinawa soba, hiyashi soba brings in mainland Japanese flavors, offering a lighter, plant-based option perfect for late spring and summer when the body craves freshness and clarity.

Health Notes

• Soba (buckwheat noodles): High in rutin and fiber; supports circulation and blood vessel health.

• Daikon: Cooling and digestive; helps clear internal heat and phlegm.

• Cucumber: Hydrating and detoxifying.

• Nori and sesame seeds: Mineral-rich, support the nervous system and adrenal glands.

• Shiso or ginger: Lightly warming to balance the cold nature of the dish.

Ingredients (Serves 2)

• 200g dried soba noodles

• Ice water (for chilling noodles)

Mentsuyu (dipping sauce):

• 1½ cups water

• ½ cup soy sauce or tamari

• ½ cup mirin

• 1 piece kombu (2–3 inches)

• Optional: handful of bonito flakes or dried shiitake for vegan umami

Toppings (adjust seasonally):

• Julienned cucumber

• Grated daikon

• Shredded nori

• Toasted sesame seeds

• Thin omelet strips or tofu (optional)

• Shiso leaves, chopped scallion, or grated ginger

• Wasabi (optional)

Preparation Tip

Chill everything in advance—including your plates or bowls—for the most refreshing experience. Rinse noodles thoroughly to remove starch and enhance their bouncy texture.

Method

1. Cook soba:
   Boil noodles according to package instructions (usually 5–7 minutes). Stir gently while cooking.

2. Rinse and chill:
   Drain and rinse noodles under cold water, rubbing gently to remove excess starch. Transfer to a bowl of ice water until ready to serve. Drain just before plating.

3. Prepare sauce:
   In a small pot, combine water, soy sauce, mirin, kombu, and bonito or shiitake if using. Bring to a gentle simmer for 5 minutes. Strain and cool.

4. Prep toppings:
   While sauce cools, prepare and chill toppings. Grate daikon, julienne cucumber, slice shiso, etc.

5. Assemble:
   Divide noodles into shallow bowls. Artfully arrange toppings on top. Serve with mentsuyu in a separate small cup for dipping, or pour lightly over noodles if preferred.

Serving Suggestion

Enjoy hiyashi soba as a standalone meal during hot days, or serve as part of a cooling lunch set with jimami dōfu, pickled shima rakkyo, or a light miso soup with a-sa seaweed. It’s a dish of balance—cooling but not depleting, simple but deeply satisfying.