I like to do several cooking projects while I'm in the kitchen. It is just a more efficient use of my time. I decided to make some soup stock while preparing dinner. First, I caramelized some diced onion. You can use any type of oil.
Next, I used the leftover pieces of washed celery from my salad. Make sure to trim off the leaves from the celery...they have a bitter taste. I cut up a carrot, minced some garlic and added 8 cups of water. Later, I added the caramelized onion (sorry, forgot to take a picture). Start off cooking the stock at a gentle boil, then reduce the heat to low and simmer for 1 hour. You lose the nutritional value after an hour.
The finished product is the first picture in this post. You can store it in the freezer for later use. I'm putting mine in the refrigerator, and will use it in a recipe next week. Making your own stock is very easy to do, and very economical. Purchase onions in a bag...they are less expensive that way. I wash the carrot, gently scrubbing it but I don't scrape it.