A container or freezer bag kept in the freezer is the perfect home for onion ends, carrot peels, celery tops, and other vegetable scraps that would otherwise be tossed.
A Freezer Trick That Turns Vegetable Scraps Into Soup

Those vegetable ends and odd leftover bits that usually go straight into the trash can actually become the start of a great pot of soup, with almost no extra effort.
Keep a Vegetables Box in the Freezer
Turn the Scraps Into Soup
Once the container is full, the frozen scraps can go straight into a pot with water and seasonings to simmer into a flavorful vegetable stock or soup base.
Make It Your Own
Adding a handful of rice, pasta, or leftover cooked meat turns the simple stock into a more filling meal, and it's easy to vary the flavor with whatever herbs and spices are on hand.
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