Tsuyu Recipe: Japanese Dipping Sauce and Noodle Broth Base

Tsuyu (つゆ) — also called mentsuyu (麺つゆ, "noodle sauce") — is the concentrated Japanese sauce and broth base used for cold soba dipping, tempura dipping, hot udon broth, and dozens of other applications. It's sold bottled in Japanese grocery stores but takes 10 minutes to make from scratch, tastes significantly better homemade, and keeps for two weeks.

Understanding tsuyu also means understanding a system: you make a concentrated version and dilute it at different ratios for different uses.

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Ingredients (makes about 1 cup concentrated tsuyu)

• 1 cup kaeshi (strong seasoned soy base) — see below
• 1½ cups dashi (kombu + katsuobushi, standard recipe)

For the kaeshi:

• ½ cup soy sauce
• 2 tablespoons mirin
• 1 tablespoon sake
• 1 tablespoon sugar

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Making Kaeshi

Kaeshi is the non-dashi component of tsuyu — the concentrated soy-mirin base. Traditional kaeshi is "rested" for weeks, but a quick version works well.

Combine mirin and sake in a small saucepan over medium heat. Simmer 2-3 minutes until the alcohol evaporates. Add soy sauce and sugar. Heat over low heat, stirring until sugar dissolves. Do not boil — bring to just below a simmer and hold for 2 minutes. Remove from heat. Cool completely.

Store kaeshi at room temperature in a sealed jar. It keeps for months.

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Making Tsuyu

Combine kaeshi with cold dashi in a ratio of 1:1.5 (1 part kaeshi, 1.5 parts dashi). This is concentrated tsuyu — not ready to eat directly, but the base for all applications.

Dilution ratios for different uses:

| Use | Concentrated Tsuyu : Water | |-----|---------------------------| | Cold soba dipping (tsukeziru) | 1:2 | | Tempura dipping | 1:3 | | Hot soba/udon broth | 1:6 to 1:8 | | Ochazuke | 1:8 | | Karaage marinade | Undiluted | | Braising liquid | 1:1 | | Sunomono (vinegared dish) | Add to taste |

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Cold Soba Dipping (Zaru Soba)

The primary use. Cook soba noodles per package instructions. Rinse under cold running water until completely cold, rubbing the noodles to remove surface starch. Pile on a bamboo tray or plate.

Dilute tsuyu 1:2 with cold water. Pour into individual small cups. Dip a small bundle of cold noodles into the tsuyu, coating lightly, and eat. Don't submerge the whole bundle — Japanese soba eating is about getting a light coating of sauce, not drowning the noodles.

Condiments: Wasabi (fresh grated if possible), finely sliced scallions, and grated daikon are the classic additions. Stir a little wasabi into the tsuyu as you eat.

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Tempura Dipping Sauce (Tentsuyu)

Dilute tsuyu 1:3 with water. Add grated daikon directly to the dipping bowl. The radish enzyme breaks down the oil in freshly fried tempura, making it lighter and less greasy.

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Other Uses

Karaage marinade: Use concentrated tsuyu (undiluted) mixed with a tablespoon of garlic and ginger paste. Marinate chicken pieces 30 minutes before coating in potato starch and frying.

Tamagoyaki seasoning: Add 1 tablespoon tsuyu to the egg mixture for Japanese rolled omelette. The soy-dashi flavor is built in.

Gyudon braising liquid: Use as the base for Japanese beef rice bowls, diluted 1:1 with water and a little extra mirin.

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Store-Bought vs Homemade

Japanese grocery stores sell mentsuyu in bottles — brands like Kikkoman, Mizkan, and Ninben. These are convenient and adequate. The bottled version typically uses chemical dashi and a more aggressive salt profile than homemade.

Homemade tsuyu made with real kombu-katsuobushi dashi has noticeably more complexity — the umami is rounder, the salt less sharp. For applications where tsuyu is the primary flavor (cold soba dipping), the difference is significant. For cooking applications (braising, marinade), bottled is fine.

Storage: Concentrated homemade tsuyu keeps 1-2 weeks refrigerated. Kaeshi alone keeps months at room temperature. Make kaeshi in a large batch, make tsuyu as needed.