These grilled oyster mushrooms are packed with flavor and so easy to make. White truffle oil in the dressing complements the earthiness of the mushrooms, while putting them on the grill until caramelized brings out their natural umami flavor.
Combine all of the ingredients in a jar or leakproof container and shake well to combine. Set aside.
Marinate the mushrooms in the canola oil, olive oil, 1 tablespoon of the salt, thyme, and shallots for 1 hour. Preheat the grill over high heat. Grill until caramelized and crispy on all sides. Toss the mushrooms with the dressing, parsley, cheese, remaining salt, and freshly ground black pepper, to taste.