Fish Stock

Ingredients

• 2 lb beef or veal
• white fish trimmings
• 2 onions
• 1/2 lemon rind
• 1 bunch of sweet herbs
• 2 carrots
• 2 quarts water

Method

Start with cold water. Place the fish trimmings, beef or veal bones, onions (halved, skin on), carrots, lemon rind, and herbs into a heavy pot and cover with the cold water by two fingers. This matters: a cold-water start stock means you'll gather more of the water-soluble proteins and gelatin that define a clean, body-rich broth. A hot-water plunge seals the surface and traps those compounds inside the meat.

Bring to a bare simmer — not a rolling boil — over moderate heat. As soon as the surface breaks, reduce to the gentlest possible bubbling. Skim away the grey-white scum and any solids that float for the first 10–15 minutes. This is foam-bound protein and blood; it clouds the finished stock and leaves a slightly sour, mineral taste. Don't rush this. Your stock will be translucent and clean only if you catch it now.

Maintain that gentle simmering for 45 minutes to an hour. Fish stocks are not beef stocks — the bones break down faster, and prolonged heat will boil away the delicate flavour compounds that make white fish stock different from vegetable broth. Taste at 40 minutes; you should detect a faint sweetness and a mineral edge from the fish. That's your signal you're extracting, not destroying.

If you want a richer, deeper stock — the older recipe's optional route — sweat the chopped vegetables in butter first until they colour lightly and begin to caramelise, then add the fish trimmings and bones and let them cook dry for 2–3 minutes before adding water. This flavour-building step develops umami and body at the cost of clarity; the stock will be slightly opaque and more assertive. Choose based on your end dish: a delicate sole sauce wants the gentle version; a fish chowder base benefits from the roasted approach.

Strain through a fine sieve, pressing gently on the solids to extract any remaining liquid without crushing the bones and clouding the result. Do not wring or force. Cool rapidly in a wide, shallow pan — a warm stock invites bacterial growth. Use within two days, or freeze.