Bring a large pot of salted water to a boil.
Add mushrooms, cook for 4-5 minutes, until tender.
Meanwhile, combine Olio Taibi extra virgin olive oil of choice, red wine vinegar, salt, oregano, black pepper, red pepper flake in a large bowl.
Drain mushrooms from pot, add to big bowl with dressing. Stir to coat and marinate.
When cool, add parsley.
Serve at room temperature. (see note)