Place mushrooms in the bowl of a food processor and process until pieces no larger than 1/2-inch remain, about 6 short pulses. Transfer to a small saucepan. Add vegetable oil stir to combine. Place over medium-high heat and cook, stirring occasionally, until mushroom places shrink and are deep golden brown, about 8 minutes. Pour through a fine mesh strainer set over a small bowl. Reserve mushroom pieces and discard all but 1 tablespoon oil.
