Chop up 3 chorizo and put them in a medium pot with half a handful of dried porcini and 1 sheet of dried nori (torn up). If you have a brulee torch, give some of the chorizo a bit of colour. If not, put the pot over a hot stove and stir for 30 seconds.
Add enough water to just cover the contents and put in a low oven (around 100c) for 3 or so hours.
Strain into a smaller pot. You can either further reduce the contents (by around ¾) for an intense sauce, or keep as is, add 2 tablespoons of olive oil and blend and add to other sauces/dishes for a rich (but less intense) boost at the end.
If you let it cool or use it later, make sure you include some of the fat that congeals. The majority of flavour is in that fat.
You can still keep the chorizo that were strained off and cook with them too. They won’t be as strong or oily, but can still be used in heaps of different ways.
Over the next 2 days I'll show you 2 things you can cook with the jus.