Konbu Dashi (昆布だし, kelp stock)

Ingredients

Equipment Needed

• •Medium pot
• •Fine-mesh strainer
• •Clean cloth for wiping the konbu

Instructions

1. 1

   Wipe the konbu

   Look over the konbu and wipe it lightly with a damp cloth if there is grit. Don't scrub it and don't rinse it under running water. The pale powder on the surface is not dirt, it is part of the flavor you are trying to draw into the water.

   If the konbu smells clean and marine, leave it nearly alone. Sourcing comes first here, as always.
2. 2

   Soak cold

   Put the konbu in the cold water and leave it at room temperature for 3 to 4 hours, or refrigerate it overnight. Cold water draws out sweetness and depth gently, without pulling harshness from the kelp. The konbu will soften and the water will take on a faint gold-green tint.

   For the cleanest temple-style stock, the cold soak alone is enough. Warming gives a little more body, but the cold infusion is already dashi.
3. 3

   Warm slowly

   Set the pot over low heat and warm the water slowly, about 10 to 15 minutes. Watch the sides of the pot, not the clock. When small bubbles begin to gather and the surface starts to tremble, the konbu has given what you want.

   Slow warming protects the clear taste. A hard rush to heat pulls rougher flavors from the kelp before you can stop it.
4. 4

   Remove the konbu

   Lift out the konbu before the water boils. This is the step that decides the stock. Boiled konbu can make the dashi cloudy, slippery, and bitter, which is a poor trade for a few more seconds of heat.

   You're not cooking the kelp. You're asking it politely for its flavor, then letting it leave before the conversation turns rough.
5. 5

   Strain and use

   Strain the dashi through a fine-mesh strainer if you see any sediment. Use it at once, or cool it quickly and refrigerate it. It should taste light, clean, and faintly sweet, with a sea-breeze scent rather than a strong seaweed smell.

Chef Tips

• •Buy thick, well-dried konbu with a clean ocean scent and a pale bloom on the surface. If it smells musty or stale, change the dish. Nothing good begins with tired kelp.
• •Don't replace this with instant powder when konbu is the whole point. Powder can season a busy weeknight soup, yes, but it won't teach you what clear dashi tastes like.
• •The used konbu still has life. Slice it thin and simmer it with soy sauce, sake, and a little sugar for a small relish, or add it to a pot of beans to soften their edges.
• •For a deeper meatless dashi, add 2 dried shiitake mushrooms to the cold soak. That makes konbu-shiitake dashi, a proper temple-kitchen foundation, not a lesser stock.

Advance Preparation

• •Start the konbu in cold water before bed and refrigerate it overnight. In the morning, warm it gently and pull the kelp before the boil.
• •Finished konbu dashi keeps up to 3 days refrigerated. Reheat gently and do not boil it hard.
• •Freeze extra dashi in small portions for simmered vegetables, miso soup, or quick weeknight broth.

Frequently Asked Questions

Nutrition Information

1 serving (about 240g)