How to Make Vegetable Stock from Kitchen Scraps (and Stop Throwing Money Away)

Every time you trim an onion, peel a carrot, or snap the woody ends off asparagus, you're holding the makings of something genuinely delicious — and most of us toss it straight in the bin. Those humble scraps are packed with flavor, and with almost no extra effort they can become a rich, savory vegetable stock that beats anything from a carton.

Homemade stock is one of the easiest wins in a low-waste kitchen. It costs essentially nothing, freezes beautifully, and turns soups, risottos, grains, and sauces from flat to full-bodied. Here's how to build the habit and get it right every time.

Why Scrap Stock Is Worth It

Store-bought stock is convenient, but it adds up — a few dollars a carton, week after week. Making your own from scraps you've already paid for is as close to free food as it gets. The environmental case is just as compelling: vegetable trimmings are one of the biggest contributors to household food waste, and diverting them into stock keeps them out of the landfill.

• It's basically free. You're using parts you'd otherwise discard.
• You control the salt. No mystery sodium or additives.
• It reduces waste. Fewer scraps in the trash, more value from every grocery run.

Which Scraps to Save

Start a dedicated bag or container in your freezer and toss trimmings in as you cook. Over a week or two you'll have plenty for a batch. Great candidates include:

• Onion skins and ends (the skins add a lovely golden color)
• Carrot peels and tops
• Celery ends and leaves
• Leek tops and green parts
• Mushroom stems
• Herb stems from parsley, thyme, and cilantro
• Corn cobs, tomato ends, and fennel fronds

Which Scraps to Skip

Not everything belongs in the pot. A few vegetables will make your stock bitter, cloudy, or overpowering:

• Brassicas — broccoli, cauliflower, cabbage, and Brussels sprouts turn stock sulfurous and bitter.
• Starchy scraps — potato peels can make it muddy and gluey.
• Anything spoiled — wilted is fine, but moldy or slimy scraps don't belong in food. Save those for the compost.
• Beets — unless you want everything dyed magenta.

The Simple Method

Once your scrap bag is full (roughly 4 cups of trimmings), you're ready:

• Tip the frozen scraps straight into a large pot — no need to thaw.
• Cover with cold water, about 8 cups, so everything is submerged.
• Add a bay leaf, a few peppercorns, and a pinch of salt if you like.
• Bring to a gentle boil, then reduce to a low simmer.
• Simmer uncovered for 45 minutes to an hour — longer can turn it bitter.
• Strain through a fine sieve, pressing gently to extract every drop of flavor.

That's it. You'll be left with a fragrant, amber liquid ready to use or store. Compost the spent scraps to close the loop entirely.

Storing and Freezing Your Stock

Fresh stock keeps in the fridge for about four days. For longer storage, freezing is your friend:

• Pour cooled stock into ice cube trays for small, recipe-ready portions — perfect for deglazing a pan or enriching a sauce.
• Fill freezer-safe jars or bags, leaving room at the top for expansion.
• Label with the date; frozen stock stays good for up to three months.

If you're already tracking what's in your freezer and fridge, add your stock stash to the list so it actually gets used. A tool like Food Waste Manager makes it easy to keep tabs on homemade staples alongside your groceries, so nothing hides in the back and quietly expires.

Putting It to Work

Homemade stock elevates almost anything savory. Use it as the base for soups and stews, to cook rice and grains for extra depth, to loosen a pasta sauce, or to steam vegetables with more character. It's the quiet backbone of good home cooking.

Making stock from scraps is one of those small habits that pays off far beyond the kitchen — less waste, lower grocery bills, and better food. If you enjoyed this, you might also like our guide on what to cook with what you have and our tips on how to freeze food to reduce waste. Your future self — and your wallet — will thank you.