The next day remove the stock in cup and the carcass from fridge. You can devide the fat from the stock quite easily. You can use both or just the jellytpye stock from the bottom. I use both for a stronger flavour, but it is not necessary. Dont use just the fat though. Put the jelly in a soup pan, heat gently until dissolved. Pull the leftover meat of the carcasse cut into bitesize cubes, add to pan.