mushroom (I use shiitake, oyster mushroom and king mushroom)
First chop the mushrooms really fine. I use shiitake, oyster mushroom and king mushroom. You can use a food processor for this but be careful because it will damage the mushrooms. Now cut the onion in half and clean it. Then chop it. After, add a drizzle of oil to a hot frying pan and glaze the chopped onion with the salt. Then add the chopped mushrooms and pan fry it till it starts to color. Do this on a medium high heat and take your time for this. Then add the leaves from the thyme and deglaze the pan with the vegetable broth. Reduce this completely. Then season it with the sushi vinegar. Give it a taste for seasoning and when necessary, add some salt. Now transfer it into a bowl and keep it in your fridge for later.