Clean the mushrooms and rub them with kitchen paper. Clean and wash the spring onions and cut into fine rings. Peel and finely chop the garlic.
Then heat the oil in a pan and add the mushrooms. Let simmer for about 2 minutes. Add the chopped garlic and spring onion rings to the mushrooms and sauté briefly. Then season everything vigorously with salt, pepper and the dried thyme and deglaze with the white wine. Let the whole thing stew for another 3 minutes. Remove from heat, transfer to a bowl and allow to cool.
Then let it steep in the refrigerator for about 2 hours.