Step 1: Add parsley and wine to a food processor and process until finely chopped.
Step 2: Add olive oil to a saucepan and heat over medium-low and add garlic and shallots and saute until softened, about 3 - 4 minutes.
Step 3: Add wine and cold butter and stir until melted.
Step 4: Add chopped parsley and lemon juice and cook for a minute longer and then remove from heat, season with salt and pepper, then set aside.
Step 5: Preheat oven to 220°C (425°F).
Step 6: Cut mushrooms in half lengthwise and cut cross hatch marks on inside surface of the mushrooms.
Step 7: Heat olive oil in a grilling pan and when hot, add mushrooms cut side down and sear then flip over and sear on the other side.
Step 8: Pour in vegetable stock and transfer frying pan to the oven and roast for 30 minutes.
Step 9: To serve, add parsley sauce to a plate and top with roast king oyster mushroom.
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