IN BOOK 10 of the Analects, Confucius is watched at table.

He would not touch rice gone sour, or fish that had turned. He would not eat meat cut the wrong way, or meat served without its proper sauce. However much of it was on the table, he never let the meat outweigh the grain. Ginger was never taken away. He did not eat much. He did not talk while he ate.

Two and a half millennia after Confucius, India marks Teachers' Day on 5 September, the birthday of Sarvepalli Radhakrishnan, who spent three decades as a professor before becoming President of India. Ask what he ate, though, and the record goes quiet. Nothing survives that can be trusted: no beloved dosa, no favourite bowl of curd rice. A household's culinary tradition is not a list of one man's favourites.

That silence is the normal condition, not the exception. History keeps a teacher's public ideas far more carefully than the habits of the body that carried them. When those habits do survive, food does something no biography quite manages: it brings a celebrated mind down off its plinth and sits it at a table, with a plate in front of it and a decision to make.

A menu is not a key that unlocks a philosophy, and a plain diet does not prove virtue. But food leaves unusually intimate evidence. It records what a person accepted, refused, shared, regulated or regretted — not a list of favourite dishes, but the messier meeting of an idea and a life.

THE DISCIPLINE OF APPETITE: CONFUCIUS AND SOCRATES

Few philosophical texts watch their subject eat as closely as Book 10 of the Analects watches Confucius. The portrait his followers assembled is exacting to the point of comedy: no discoloured food, nothing that smelled wrong, nothing ill-cooked, nothing out of season. Even when the meal was only coarse rice and vegetable soup, he set a little aside as an offering, with a grave, respectful air.

Read singly, these look like the demands of a difficult diner. Read together, they are li — proper conduct — rehearsed in the smallest arena available. Moral cultivation did not wait for the court or the classroom. It was practised in proportions, in timing, in what a man did with an ordinary bowl.

Which is why the one exception matters. In wine, the Analects notes, he set himself no limit — but never let it confuse him. Not a loophole: the same principle stated backwards. The discipline was never in the rule. It was in the man keeping it.

Socrates worked the same problem in a rougher Athenian key. Xenophon has him eating only as much as he could enjoy, and arriving hungry enough that appetite was his sauce. The sophist Antiphon mocked his poor food and the cloak he wore through summer and winter, and called him a teacher of unhappiness. Socrates thought his few needs a form of independence: a man ruled by food, drink, sleep or money, is not free.

This was never a flight from pleasure. In Plato's Symposium, Alcibiades marvels that Socrates could drink all night and never appear drunk; at dawn, while the others slept it off among the couches, he got up and went about his usual day.

Two men, two ends of Eurasia, the same lesson served differently. Self-command is not a speech you deliver. It is something you perform, mouthful by mouthful.

A LAST MEAL WITH NO SETTLED MENU

Food sits at the centre of the Buddha's Middle Way, which refuses both indulgence and self-denial. Yet the meal most firmly attached to his name is the one nobody can identify.

The Mahaparinibbana Sutta records that at Pava, Cunda the metalworker served him a dish called sukara-maddava. Careful modern editions leave the word untranslated. Sukara is pig; maddava is soft, or tender. It can mean tender pork. It can equally mean something pigs enjoy — a mushroom, a tuber, a bamboo shoot. The commentaries themselves offered several answers, which suggests that its meaning was already uncertain to the people copying out the story.

He asked that it be served to him alone, and that whatever was left be buried in a pit. A grave illness followed.

What happens next is the part worth keeping. Anticipating that Cunda might be blamed, the dying teacher told Ananda how to reassure the smith: of all the meals ever offered to him, two carried the greatest fruit — the one taken before his enlightenment, and the one taken before his end. Even then, he used the moment to protect a man from spending the rest of his life believing he had killed the Buddha.

Readers have spent centuries trying to solve the menu. The story puts its weight elsewhere.

GANDHI'S DIET WAS HIS AUTOBIOGRAPHY

Nobody here wrote about food more relentlessly than Mohandas Gandhi, and nobody comes off worse in their own account.

As a schoolboy he ate goat's meat in secret, at a lonely spot by the river, talked into it by a friend who argued that the British ruled India because they ate meat. That first attempt brought not strength but a night of remorse and a dream of a live goat bleating inside him. Yet he ate meat several more times before the lies to his parents made him stop.

In London, keeping a vegetarian vow made to his mother, he found a vegetarian restaurant on Farringdon Street, saw Henry Salt's A Plea for Vegetarianism among the books displayed under glass beside the door, bought it for a shilling and went in to eat. In that pamphlet he found an argument for what had been an inherited obligation. The experiments never stopped: bread and fruit, no condiments, a brief lapse into eggs, abandoned the moment he understood that his mother's definition of meat had included them. The real seat of taste, he decided, was not the tongue but the mind.

The experiment that cost him was milk. Sickened by cruelty in the dairy trade, he had vowed off animal milk altogether. Then illness left him too weak to stand, and his doctor said he would not recover without it. It was Kasturba who found the opening: the vow, as he had taken it, had cow and buffalo in mind. He drank the goat's milk — and wrote that he had kept the letter of the vow and broken its spirit, that the wish to live had beaten his devotion to truth.

He never presented himself as the serene winner of a moral test. A glass of goat's milk could put truth, health, ambition and service in one room and make them fight. His diet was his autobiography because it recorded not purity, but revision.

WHAT SANTINIKETAN SERVED ITS FIRST STUDENTS

Rabindranath Tagore opened his school at Santiniketan in 1901 as an argument against enclosed, rote-driven education. Classes met under the trees. Art and nature were curriculum, not decoration.

It reached the dining hall too. His son Rathindranath, one of the first pupils, remembered a menu so monotonous he could compare it only to prison food: muri and gur for breakfast, bland lunches, blander dinners, and on Wednesdays, luchi and sugar. Boys ate quietly, were not to criticise what they were given, and washed their own plates afterwards.

The obvious story here is the indulgent poet imposing austerity on other people's children, and it does not survive the evidence. Tagore ate the same vegetarian food through those years — partly, the accounts suggest, because money was short, and partly because he wanted to eat what the school ate.

Nor was the ashram sealed off from the kitchen. Rathindranath also remembered his mother, Mrinalini Devi, calling the boys up to the house and cooking them something worth eating. Food moved between discipline and care, between the rule of the institution and the relief of a domestic stove.

Tagore's own table never held still. Across his life he swung between vegetarian and not, through egg diets and vegetable diets, changing course on whichever friend had his ear; late on he described himself, drily, as a domesticated vegetarian. What stayed constant was the sociability: a full spread might be set before him at lunch and he would eat almost none of it, sending the dishes on to other residents.

Santiniketan's early menu was no lesson in pleasure. It did put discipline, shared conditions and self-reliance into the routine of a school day. Not every lesson worth examining is one a pupil enjoys.

THE MONK WITH AN APPETITE

Swami Vivekananda is the counterweight. In The East and the West he refused to treat vegetarianism as a universal rule, arguing that diet had to answer to circumstance and labour — and he lived the argument with obvious pleasure. The recollections Mani Shankar Mukherjee gathered in Ahare Anahare Bibekananda have him owning a French cookery book before he owned a copy of the Vedas, cooking pulao and khichuri for whoever was there, and waiting for ice cream after dinner with what one witness called child-like eagerness. At Belur Math on 4 July 1902 he sat down to lunch with the monks — rice, hilsa curry, vegetable fry, ambal — joking that the ekadashi fast had sharpened his appetite. He died later that evening, after retiring to meditate.

WHAT THE TABLE CAN TEACH

Menus do not explain philosophies. Radhakrishnan's undocumented plate is a standing warning against invention. But the better-recorded tables show something more useful than preference: attention, in ginger never taken away; independence, in an appetite treated as sauce; compassion, in a message sent to a frightened smith; revision, in a glass of goat's milk; shared conditions, in a bowl of muri and gur; and plain, unembarrassed appetite in a plate of hilsa.

Teachers' Day marks what gets passed between generations. So does food. A teacher transmits what they know; a cuisine transmits what a culture remembers. Somebody takes what they have, shapes it as carefully as they can, and hands it to someone else — and what that person makes of it is the next lesson.