I hate waste of any kind and so make onion powder from the skins of onions and garlic, and the bits of onion that I had taken off when preparing onions to cook. I dehydrate these (I used the sun but you can use a dehydrator or an oven), and then ground them. I found a coffee grinder the best thing to do this as my food processor did not grind them small enough.
The bits just under the paper skin give the most taste but you have to make sure that they are fully dry and that they snap when broken before grinding. I add this onion powder to soups, stews and baked goods to add extra taste, with out the need for more ingredients. I love knowing that something that I would have previously thrown away is not adding taste to my food. Every little saving helps. Do you make anything from products that you used to throw away?