Raw Marinated Mushrooms

1 ½ pounds button mushrooms

1 ½ tablespoons salt

1 ½ tablespoons white sugar

¼ teaspoon crushed red pepper

¼ teaspoon black pepper

¼ teaspoon dried oregano

½ teaspoon monosodium glutamate (such as Ac cent®)

1 teaspoon chopped garlic

1 onion, chopped

¾ cup white vinegar

⅓ cup olive oil

Combine the mushrooms, salt, sugar, red pepper, black pepper, oregano, monosodium glutamate, garlic, onion, vinegar, and oil in a large container. Mix well. Cover the container and allow mixture to marinate in refrigerator for 3 days.