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: saute the onion in 2 tablespoons olive oil until brown and then add the tomatoes, garlic, rosemary and salt and pepper. simmer until all the liquid has evaporated and a thick sauce remains. pour the lemon juice over the mushrooms and leave for 10 minutes. saute the mushrooms in the remaining olive oil. add the mushrooms to the sauce and simmer for a further 10 minutes. bring to room temperature before serving.