Heat olive oil in saucepan over
medium heat. Add onions. Cook until translucent. Add mushrooms and soy sauce and cook
about 5 minutes over medium heat. Add vegetable broth. Cook for 2 more minutes.
Transfer the cooked mixture to a
blender, add parsley and blend on high for 10 to 15 seconds or until you get the desired
consistency. Stir in sour cream. Pour over pasta or serve with grilled meat, chicken,