To prepare a straw mushroom medley beef recipe, first you need to gather your ingredients. First, you will need the following ingredients: Straw Mushrooms: You can use any type of mushrooms you like, but I like to use shiitake mushrooms. You will also need salt, pepper, thyme, oregano, and paprika. If you don't have any mushrooms, then you can substitute scallions for the mushrooms in this recipe. Saute the onions and garlic in the olive oil until they are translucent. Add the beef and cook until the meat is no longer pink, about 5 minutes. Remove from the heat and add the mushroom mixture. Season with salt and pepper to taste.