Clean the mushrooms and cut in half or into quarters depending on the size. Peel garlic and chop finely. Clean and finely chop the spring onions, separating the white and green.
Fry the mushrooms in a little oil until they are very browned. Reduce the heat and add the garlic and the white of the spring onions and sauté. Add seasoning sauces, pepper if necessary. Place on a platter and sprinkle with the green onions and, if necessary, Thai basil and serve warm or cooled to room temperature.
The dish can also be sprinkled with a little toasted sesame seeds. If you use teriyaki sauce instead of oyster sauce, the dish is vegan.