• Vegetables to use: Onions, carrots, and celery are the key ingredients in vegetable stock, but many other vegetables can add depth and flavor. Wash and save roots, stalks, leaves, ends, and peelings from vegetables such as leeks, scallions, garlic, fennel, chard, lettuce, potatoes, parsnips, green beans, squash, bell peppers, eggplant, mushrooms, and asparagus. Corn cobs, winter squash skins, beet greens, and herbs like parsley and cilantro are also good additions.
• Vegetables to avoid: Scraps from the following vegetables are better off going into the compost bin, as their flavors can be too overpowering: cabbage, Brussels sprouts, broccoli, cauliflower, turnips, rutabagas, artichokes. Beet roots and onion skins should also be avoided, unless you don't mind your stock turning red or brown.
• Spoiled vegetables: Although stock is a great way to use veggies that are wilted or slightly past their prime, be sure not to use produce that is rotten or moldy.
• Storing scraps: You will want to collect about 4 cups of vegetables to make 2 quarts of stock. Save scraps throughout the week, wash and chop them into similar sizes, and keep them in an airtight bag or container in the refrigerator. If you are collecting scraps for longer than a week, store them in the freezer.
Do you have any other tips to share?