Recently we had some good friends for Brunch and my friend Angela told me how she makes the most delicious vegetable stock from vegetable trimmings. Of course, this isn’t the first time I’d heard of this frugal stock but to be honest, I was skeptical on how good it would be — stock from trimmings? That’s bunny food! I’ve been using roast chicken carcass for soups for a few years now but I’ve never jumped into the compost bin head first to make this vegetable stock before. Angela and her husband were quite convincing on how good this stock is, so I decided to give it a try.
My first attempt was a simple stock using vidalia onion skins, garlic skins, eggplant ends, zucchini ends, celery leaves, cilantro stems and green onion ends. I made sure to wash the skins very well and tossed them into a large stock pot with enough water to cover. I tossed in a tiny bit of salt and boiled, then I reduced to a simmer for about 4 hours. WOW! I can’t tell you how good this was! For a lunch, I simply sautéed more zucchini, eggplant, onions, garlic and celery and ladled the “Compost Stock” over it and drizzled it with parmesan cheese, boy was it GOOD!
When I saw how dark and rich the onion skins made the stock, I thought: why not make a French Onion Soup from it (we’ve made French Onion Soup here and here and here before)? And that is the way this recipe came about. It’s so easy and inexpensive that I urge you to try it. You can make it vegan by omitting the cheese or just use vegan cheese (not sure how good that could be!). And if you’re looking to save a few calories, omit the croutons and the cheese.
JT tried it and could not believe it was made with onion skins and caramelized onions, no stock at all — verdict, he loved it. For this version, we saved around $4 because I usually use an organic beef stock or sometimes I even roast some beef bones which would have saved us $6.00)!
A Vegetarian French Onion Soup
A Kitchen Inspirations Original Recipe.
Makes 1.5 L (6.25 cups) of soup
- 3 large organic Vidalia onions, including skins
- 1/4 cup white balsamic vinegar
- 4 L (roughly 4 quarts) water
- 2 tbsp EVOO
- 3 bay leaves
- 1 tsp salt
- 100 g (3.5 oz) Gruyère cheese, grated (omit if vegan or vegetarian)
- croutons, enough to fill 2 French Onion Soup bowls
- Pre-heat oven to 250°F (121° F).
- Wash outer skin of the onions well. Peel onions, add skins with the bay leaves and salt to a large stock pot with 4L (4 quarts) water in it. Stir and bring to a boil then turn down and simmer for 2-3 hours.
- Slice onions very thinly on a mandoline (any larger bits that can’t be sliced, just add to the onion skin stock pot).
- Heat olive oil to a large Dutch oven and once hot (but not smoking) add onions; sweat onions until translucent and just beginning to caramelize (about 20 minutes). Add the white balsamic vinegar and stir well. Cover with a piece of parchment (as illustrated below) and bake for 2-3 hours at 250° F (121° C) or until golden and fully caramelized.
- When stock is a rich, dark colour strain through a fine sieve to remove skins and bits and finally through a very fine sieve to remove any fine particles (I use a reusable coffee filter). Combine stock with caramelized onions and heat through. Taste for seasonings and add salt and pepper as required.
- Plate in French onion soup bowls with croutons and mounds of Gruyère cheese, broil so it’s all melty and bubbly and serve hot!
- For a vegetarian or vegan version, omit the cheese or use vegan cheese.