12 curious facts about chocolate

Chocolate begins with a tree, and the tree's name is itself a fact: botanically it is Theobroma cacao, which in Greek means roughly 'food of the gods'. It grows in the humid forests of Central and South America, and its fruit is an oblong pod with a rough, ridged shell. Open one and you will not see the brown you expect: the beans are wrapped in a white, sticky, faintly sour pulp. They ferment inside that sweet pulp for several days, then are dried and roasted; the chemical foundation of the future flavour is laid right there, before any sugar appears. Chocolate flavour, in other words, is born in processing rather than in the orchard. The second fact surprises people more: in ancient Central American cultures cocoa beans were not merely food but a means of payment. Goods were bought with them at market and taxes were paid in them. Their first value was not their taste but their role as currency. So how did they become the bar we bite into? The answer comes much later than you would expect — because for centuries chocolate was not eaten at all.

For most of its history chocolate was liquid, not solid. The first recipe was not sweet either: ground cacao was mixed with water, seasoned with chilli and spices, and poured from vessel to vessel to raise a foam. A bitter, sharp, filling drink — almost unrelated to what we picture today. The drink reached Europe in the 16th century through Spain, where it met sugar and milk. For a long time it remained a privilege of wealthy tables; later, chocolate houses opened in European cities and the drink reached a broader public. The fourth fact: the solid chocolate we bite into is historically very young. Until someone worked out how to separate cocoa butter from the mass and then add it back in measured amounts, the mixture was never fluid enough to pour into a mould. The 19th century solved that, and conching — kneading and aerating the mass for hours, applied in Switzerland late in that century — gave chocolate the smooth, silky texture we know. That is how a bitter drink became a bar that melts on the tongue. So where does the family's most disputed member, white chocolate, stand?

One of the most widespread misconceptions goes like this: 'white chocolate has nothing to do with cocoa'. That is not true. What white chocolate lacks is cocoa mass — the brown, bitter, dry part of the bean. Cocoa butter is there, and it is precisely what makes white chocolate chocolate. Hence the milky white colour and the sweeter, creamier taste: the component that carries bitterness has been removed, leaving butter, milk and sugar in its place. This is also why white chocolate is the more fragile product. It cannot hide behind the strong aroma of roasted cocoa, so a difference in quality shows in the first bite: in a good one, cream, vanilla and milk notes open in sequence; in a weak one you taste only sugar. There is a practical side too — white chocolate reacts to heat and light faster than any other kind, which is why in summer it is the first to suffer in a bag or a car. The next fact explains a piece of magic that every kind of chocolate shares. First, a check that takes a minute in the boutique or at home:

Chocolate 'melting away' in the mouth is not a poetic image but physics. Cocoa butter passes from solid to liquid in a range very close to body temperature. A bar that stays firm in your hand therefore surrenders almost instantly on your tongue. Very few things in an everyday kitchen behave like that, and chocolate's 'silky' impression comes from exactly this. For the same reason chocolate leaves a mark on your fingers, loses its shape in a hot car, and a moulded figure can slump on a summer day. The property also hands you a free experiment: tasting chocolate without chewing it. Chewing ends the pleasure in a couple of seconds; melting lets the notes open in sequence — sweetness first, then fruit or roasted nut, and a long bitterness at the very end. Professional tasting works much the same way and needs no special equipment. The next fact explains what the sound of a good bar snapping actually means. First, a small experiment:

Snap a well-made solid bar and you hear a dry, clean crack, and the broken surface is glossy rather than matt. Behind that lies tempering: bringing cocoa butter into the right crystal structure through controlled heating and cooling. Properly tempered chocolate shines, does not melt instantly in your fingers, and breaks cleanly. Untempered chocolate looks dull, softens quickly in the hand, and bends instead of breaking. Craft is invisible to the eye, but it announces itself in sound and shine. The eighth fact removes a common fear. Seeing a white film on chocolate, many people take it for mould and throw the box away. In most cases it is what is called bloom: the product sat in the warmth and cooled again, so cocoa butter migrated to the surface; or moisture dissolved the sugar and left a white crystalline layer as it dried. A white bloom is the trace of poor storage, not of spoilage — the flavour dulls, the texture roughens, but nothing tragic has happened. So what does that famous percentage on the label actually tell you?

'70% dark' is often read as a mark of quality, when in fact it states nothing but a proportion. The number gives the share by weight of the parts that come from the cocoa bean — cocoa mass and cocoa butter together. The rest is mostly sugar, plus additions such as milk and vanilla. So as the percentage rises, sugar falls and bitterness and cocoa intensity climb. In milk chocolate the figure is lower because milk powder takes up part of the recipe; in white chocolate the comparison is meaningless altogether, since there is no cocoa mass at all. An important conclusion follows: a high percentage does not automatically mean 'better'. A dark bar made from weak beans can be dry and coarse, while a milk chocolate made from well-chosen beans can be balanced and rich. The percentage tells you the direction of the flavour, not its level. The next fact shows who in the house that very same chocolate is genuinely dangerous for. First, a short checklist for choosing:

Cocoa contains a natural compound called theobromine. The human body breaks it down relatively quickly, while the metabolism of dogs and cats handles it very slowly; the substance accumulates and can cause poisoning. Dark chocolate and cocoa powder carry more theobromine, so they are riskier than milk chocolate. White chocolate is the least risky in that respect, yet its load of fat and sugar still makes it unsuitable for an animal. The same rule covers cocoa cakes, hot chocolate and desserts dusted with cocoa powder. This is not a 'what harm can one piece do' matter. In a home with a pet, do not keep a box of chocolate on the coffee table, in a bag or on a low shelf; even a closed box smells, the aroma draws the animal in, and cardboard is no barrier. If an animal has eaten chocolate, do not wait — call a vet immediately. Incidentally, the fact that this aroma travels so far is no accident — and that same quality works against you when you store chocolate.

Cocoa butter draws in aromas like a sponge. Leave an open bar in the fridge next to cheese, onion or last night's dinner and a day later it carries their smell. On top of that, condensation forms on chocolate taken out of the fridge: water dissolves the sugar and, as it dries, leaves that white, rough layer — this is exactly how the bloom we discussed above is born. The fridge does not protect chocolate; more often it damages it from two sides at once. The right place is simple: cool, dry, dark and odour-free. A kitchen cupboard the light does not reach, or a pantry shelf, will do; a windowsill, the space beside the stove or a car interior will not. If Baku's humid summer heat leaves you no choice but to chill it, put the chocolate in an airtight container and let it come back to room temperature without opening the lid — opening it too soon undoes all that care in a couple of minutes. Do not leave an opened box half-finished for long: in a bar, the first thing lost is not the flavour but the aroma. And the last fact explains why all this talk of aroma matters so much. Practical rules:

The tongue mainly reports sweet, salty, sour, bitter and umami. The words we reach for when describing chocolate — 'fruity', 'roasted', 'caramel', 'floral' — belong to smell rather than taste: volatile compounds released in the mouth travel up the back passage into the nasal cavity, and the brain files them as part of the flavour. That is why, to someone with a blocked nose, the finest chocolate and the most ordinary one taste much the same. You can test this right now. Pinch your nose with two fingers, put a piece of chocolate in your mouth and let it melt — you will register only sweetness and a faint bitterness. The moment you release your fingers, the whole complex aroma opens at once. For the same reason cold chocolate seems poorer: at low temperatures fewer volatile compounds are released. Taking chocolate out of the cool a few minutes before tasting is the easiest of these twelve facts to apply. Next time you open a box, smell under the lid first: the aroma will tell you how the bar has been kept before you even taste it.