Why Dashi Matters More Than You Think
In Japanese cooking, dashi is not just a stock — it's the foundation of flavour for miso soup, ramen broth, udon soup, tamagoyaki, nimono (simmered dishes), and countless other preparations. Unlike Western stocks that simmer for hours, most dashi is made in under 30 minutes and relies on a phenomenon called umami — the savoury fifth taste — extracted from carefully chosen natural ingredients.
Getting comfortable with dashi will transform your Japanese cooking more than any other single skill.
The Three Main Types of Dashi
| Type | Key Ingredients | Flavour Profile | Best Used For |
|---|---|---|---|
| Ichiban Dashi | Kombu + katsuobushi | Delicate, clean, savoury | Clear soups, chawanmushi, dipping sauces |
| Niboshi Dashi | Dried small sardines (niboshi) | Robust, slightly fishy | Miso soup, hearty noodle broths |
| Kombu Dashi | Kombu only | Mild, clean, vegan | Vegetable dishes, tofu, vegan recipes |
How to Make Ichiban Dashi (First Dashi)
This is the most versatile and prized dashi. The name means "first drawing" because it uses the first, most flavourful extraction from the ingredients.
Ingredients
- 1 litre cold water
- 20 g kombu (dried kelp)
- 30 g katsuobushi (bonito flakes)
Method
- Place the kombu in cold water and let it soak for at least 30 minutes (or overnight in the fridge for a more flavourful result).
- Place the pot over medium-low heat. As the water approaches 60–70°C — you'll see small bubbles forming on the kombu — remove the kombu. Do not let it boil with the kombu in, as this makes the dashi slimy and bitter.
- Bring the liquid to a gentle boil, then turn off the heat.
- Add the katsuobushi all at once. Do not stir. Let it steep for 3–4 minutes until the flakes sink to the bottom.
- Strain through a fine-mesh sieve lined with cheesecloth. Do not press or squeeze the flakes.
How to Make Kombu Dashi (Vegan)
Simply soak 20 g of kombu in 1 litre of cold water for a minimum of 3 hours, or overnight. Either use it cold (cold brew method) or gently heat it to just below boiling and remove the kombu. The result is a subtle, clean-tasting stock perfect for vegan Japanese cooking.
How to Make Niboshi Dashi
- Remove the heads and guts of 30 g of dried niboshi (these can make the stock bitter).
- Soak in 1 litre of cold water for 30 minutes.
- Bring to a gentle simmer and cook for 10 minutes, skimming any foam.
- Strain and use immediately.
Storing Dashi
- Fresh dashi keeps in the refrigerator for up to 3 days.
- It can be frozen in ice cube trays for up to 1 month — handy for quick weeknight cooking.
- Avoid adding salt before storing, as this shortens its shelf life.
What to Do with the Leftovers (Niban Dashi)
Don't throw away your used kombu and katsuobushi. You can make a "second dashi" (niban dashi) by re-simmering them in fresh water for 15–20 minutes. It's less refined but perfectly suitable for miso soup, braised vegetables, and everyday cooking.
Once you have a batch of dashi in the fridge, a bowl of miso soup or a pot of udon is only minutes away. It truly is the most foundational skill in the Japanese kitchen.