Make this recipe a recipe that people in that category can eat. categories: ['low_calorie'], recipe: place the mushrooms in a flat serving dish. place the rest of the ingredients into a small heavy saucepan. bring the ingredients to a boil and cook until the onions soften. pour the marinade over the mushrooms and arrange the onion slices around the mushrooms attractively. let the mushrooms marinate at room temperature for 4 hours, stirring frequently. refrigerate for at least 24 hours.

Target recipe: in a non-aluminum saucepan, combine vinegar with 1 1/2 cups water and heat to boiling. add cleaned mushrooms (clean with damp cloth, not water so they don't absorb the water);. boil 2 minutes. drain and reserve 1/2 cup reserved cooking liquid. cool mushrooms for 1 hour. mix the 1/2 cup reserved liquid with the italian dressing and seasoning; pour over cooled mushrooms. add salt and pepper to taste. i prefer them warm but they are also delicious cooled.