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It is iron sulphide, formed by a harmless chemical reaction between the yolk and the white — and it is a reliable sign that the egg was cooked too long or too hot. Egg white contains sulphur-bearing
Fermentation is the controlled conversion of sugars and starches by microorganisms — bacteria, yeasts or moulds — into acids, alcohol or gases. It preserves food because those products create
Because it is the only opportunity to season the pasta itself rather than just what goes on top of it. Salt added to the sauce sits on the surface; salt in the cooking water is absorbed into the
The grades describe how the oil was extracted and how much it has degraded — not, as many assume, how the olives were pressed or how many times. Extra virgin is the top grade. It is mechanically
To develop gluten — the protein network that traps gas and gives bread its structure. Without it, dough cannot hold the bubbles that yeast produces, and the loaf collapses into something dense. Wheat
Cooler than most people serve it. "Room temperature" is a phrase from an era of unheated stone houses, where a room was around 15°C. A modern heated room at 21°C is well above the point where most
Natural cocoa is acidic. Dutch-process cocoa has been treated with an alkali to neutralise that acidity. The difference changes colour, flavour and — critically for baking — how the cocoa reacts with
Yes, though "goes off" overstates it for most wines. What happens is oxidation: exposure to air changes the flavour, first improving many wines and then progressively flattening them. Oxygen reacts
Because milk forms a skin, and that skin traps the steam trying to escape. When water boils, bubbles of vapour form, rise and burst freely at the surface. Nothing holds them, so water can boil
Partly because sodium suppresses bitterness, and partly because salt affects how the tongue's receptors respond — the net effect is that sweetness comes forward. Two mechanisms are involved. The
Traditionally, stock is made from bones and broth from meat. The practical difference that follows is body: stock sets to a jelly when cold, broth generally does not. Stock is simmered from bones,
Usually over-extraction: water has been in contact with the grounds for too long, or at too high a temperature, or the grind is too fine — so the process has pulled out compounds that should have
No, not in any way that matters. The nutritional difference is negligible, and treating brown sugar as a healthier choice is one of the more persistent food myths. Most commercial brown sugar is
Because they release ethylene, a gaseous plant hormone that triggers ripening — and they release a lot of it. Ethylene signals fruit to convert starches to sugars, soften cell walls, change colour
Melting behaviour depends on three things: moisture, fat and how tightly the cheese's protein network is bound. Cheeses that melt into a smooth flow have enough moisture and fat, and a protein
Umami is the fifth basic taste, alongside sweet, sour, salty and bitter. It is the savoury, mouth-filling quality of parmesan, soy sauce, anchovies, mushrooms, ripe tomatoes and cured meat. It was
Because of genetics, and specifically because of how some people's olfactory receptors detect a group of chemicals that coriander shares with soap. Fresh coriander leaves — sold as cilantro in North