To the uninitiated, boiled-up kelp and fish flakes appear to be an unlikely basis for an entire national cuisine. But according to Tsuji, good dashi is "the first secret of the simple art of Japanese cooking".
A fitting place to begin, then. Not least because this innocuous, one-size-fits-all stock features in at least every other recipe in the Japanese cookery bible. If I was going to get anywhere, this was Square One.
So what is dashi? Simply put, it's a clear stock made from konbu (dried giant kelp) and katsuo-bushi (bonito fish flakes). And for all my ravenous consumption of Japanese foodstuffs, up until this point I'd never even heard of either of them.
Time to go shopping.

The Japanese supermarket at Piccadilly Circus had recently moved into larger premises, and the place had the feel of a newly-occupied apartment - it was all in there somewhere, but woe betide anyone asking where we packed the corkscrew/coffee-grinder/chainsaw (delete vice as appropriate).
Eventually, I enlisted the help of the mop-haired shop assistant to guide me to my new holy grails. The konbu, labelled Dried Kelps, was a packet of greeny-black sheets, thin as tree bark, covered in an uneven layer of white powder. This powder, Tsuji writes, holds much of the flavour of the seaweed. (I also discovered that konbu has nothing to do with those perfectly-formed squares of nori seaweed used to wrap sushi. Different plant altogether.)
The katsuo-bushi manifested as a large bag of onion-skin-like pencil shavings. For anyone who's ever partaken in the whole asian-fusion-noodle-bar fad, you might recognise this as the topping they like to sprinkle on stir-fry noodles - those sad little onion-y shreds that wave forlornly at passers-by from atop your dinner.
I had just one more purchase to make.
Tsuji describes this "excellent" product as capturing "the aroma of the original quite succesfully". With such encouragement ringing in my ear, and a full-time job impeding (only slightly) my ascent to black-belt-level chef-dom, I had no qualms about reaching for that little cardboard box...
Dashi (Version 0)
a.k.a. "It's 8pm, I've just gotten home, and I'm starving..."
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Buy a packet of dashi-no-moto (instant dashi stock)
- Dissolve powder in hot water, to taste
I have to confess, this has been my cunning plan all along: to use instant dashi in all recipes where a superlative stock is not the key component. Estimated hours per week saved: enough to finally justify that gym membership. Residual guilt: rather little, I'm afraid. I'm obviously a culinary philistine at heart.
Times when a great dashi is of great importance? In my mind: soup, glorious soup.
Primary Dashi (Ichiban Dashi)
Adapted from Japanese Cooking: A Simple Art by Shizuo Tsuji
Ingredients
- Konbu (dried giant kelp), postcard-sized piece
- Katsuo-bushi (bonito flakes), handful
Soak konbu in a pot, in an inch of cold water - overnight / for 30 minutes / as the water heats up (depending on who you believe).
Heat up slowly until bubbles form in water. Remove konbu just before the water boils (else bad things happen, apparently).
Add in a bit more water to bring down the overall temperature. Throw in the handful of katsuo-bushi and bring to boil for just a moment (any longer and more bad things happen).
Take pot off heat, and let the katsuo-bushi sit (30 seconds to several minutes, experiment to suit your taste), then sieve/strain/filter.
For those who keep a messy kitchen, you should now have a soggy piece of konbu by the stove and some even soggier katsuo-bushi flakes sitting in a sieve. You can use these to make secondary dashi (niban dashi) using the same process as above, rather like getting the most out of one tea-bag.
For me, once was enough. Riffing on Tsuji's clear soup recipe, I threw in a dash of soy sauce, a few blocks of tofu, chopped spring onions and shimeji mushrooms (you didn't think I went all that way for just some kelp and shaved fish, did you?), and sat down to consume Japanese Cookery 101.