Stock is one of those things home cooks either make religiously or never make at all, with very little middle ground. If you’re in the never camp, that’s a different conversation for a different day. If you’re in the makes-stock camp, there is a reasonable chance you’ve been starting it wrong — not catastrophically wrong, but wrong enough that your stock is cloudier, less clean-tasting, and slightly less rich than it could be.

The mistake is starting with hot water.

It seems logical. Hot water speeds things up. You want stock, you want it today, hot water gets you there faster. But stock is not a dish that rewards urgency, and the temperature of your starting water has a significant effect on what ends up in the pot.

Cold water starts the extraction process slowly and gently. As the water heats, proteins dissolve gradually and in an orderly way — coagulating into large particles that rise to the surface as foam, which you skim off, leaving a clear, clean-tasting liquid behind. Minerals, gelatin, and flavour compounds release slowly and fully into the liquid.

Hot water does the opposite. It causes proteins to seize and denature rapidly, breaking into tiny particles that disperse throughout the liquid rather than rising to the surface. You cannot skim them out. The stock is cloudy, slightly bitter, and structurally less clean. You’ve made a technically correct liquid that is materially worse than it could have been.

Start cold. Always.

The Method :

1. Place your bones, carcass, or vegetable scraps in a large pot. Cover generously with cold water — cold from the tap. Not warm, not hot. Cold.
   
2. Place over medium heat. Do not rush this. Allow the water to come to temperature slowly — this should take 15-20 minutes for a large pot.
   
3. As the water approaches a simmer, foam will begin to appear on the surface. This is coagulated protein. Skim it off with a ladle or large spoon, removing as much as possible before the stock reaches a full simmer. This is the most important step for clarity.
   
4. Once skimmed and simmering, reduce heat to the lowest possible simmer — the surface should barely move. Add aromatics: onion, carrot, celery, peppercorns, bay leaf, thyme.
   
5. Do not boil. A boiling stock emulsifies fat and proteins into the liquid, turning it permanently cloudy. A gentle simmer keeps everything separate and skimmable.
   
6. Simmer for the appropriate time: chicken 2-3 hours, beef or pork 4-6 hours, vegetable 45-60 minutes.
   
7. Strain through a fine mesh strainer. Do not press the solids — this forces cloudiness back in. Let it drain by gravity.
   
8. Cool quickly (ice bath if possible), then refrigerate. The fat will solidify on top and can be lifted off cleanly. What remains is the real thing.

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Why it Works :

Cold water extraction works through gentle, progressive solubility. Proteins in bone and muscle are more soluble as temperature rises — starting cold means they dissolve slowly and coagulate into large, skimmable particles.

Hot water causes rapid, violent protein denaturation, fragmenting the proteins into particles too small to skim. The gelatin extracted from collagen-rich bones — what gives good stock its body and lip-coating richness — also extracts more completely in a slow, low-temperature process.

Speed costs clarity and body. Patience produces stock worth making.

Pro Tip :

If you want to go one step further — and you should, because you’ve come this far — roast your bones before making stock. Spread them on a tray, roast at 220°C for 30-40 minutes until deep brown, then proceed with the cold water method. The roasting produces Maillard reaction compounds on the bone surface that dissolve into the stock, adding a depth of flavour that unroasted bones simply cannot provide.

This is the difference between a pale, mild chicken stock and the kind of amber, deeply savoury liquid that makes everything you add it to taste as though it took considerably more effort than it did.