Broth cooked with those bones is good for making vegetable soup, porridge, ramen, etc. To make broth, put bones (discard charred bits and fats) in a pot and add in some vegetables such as cabbage, onion and carrot. Fill in water, just enough to cover all ingredients. Bring to boil and let it simmer for 1 to 2 hours, or longer hours if time allowed. Strain, and season with salt and pepper if necessary.
For making ramen, the mushroom and vegetables can be cooked in the broth. As for noodles, boil them in a separate pot with pinch of salt. Then, arrange all ingredients in a bowl and fill in broth gently. Simple?