This post has more to do with my recipe post than not as it is a by product of my cooking. However, I truly feel that you should use as much of what you have as possible. From animals you hunt to the by products or wastes from cooking, everything can be used or even reused especially if you compost! In this case, I have saved the stock from a roast and frozen it in ice cube trays. Alongside at the older stock cubes saved from a leftover in the fridge. In either case, freeze it in ice cube trays, one cube equals one ounce. We discovered this when making baby food and that is a perfect way to measure.