Before the Cup, Tea Could Be Food
Tea does not need hot water to contain caffeine. The stimulant is already present in the leaves; brewing simply draws some of it into a drink. Chewing the leaves breaks their tough plant cells apart, mixing their contents with saliva. Any caffeine swallowed can then be absorbed through the digestive system, much as caffeine from a cup is.
That made tea usable without a pot, fuel, or a vessel for brewing. But chewing was a different experience from drinking an infusion: the leaves brought their bitter, astringent plant matter along with the caffeine, rather than leaving most of it behind in the water or strainer.
Brewing Changed the Form, Not the Ingredient
Hot water is an efficient solvent: it pulls caffeine and other flavor compounds out of leaves and disperses them through the liquid. The drinker can then leave the leaves behind. Chewing, by contrast, gives the body the leaf itself, and the amount of caffeine taken in would depend on how much was chewed and swallowed.
The practice is a reminder that tea was not always defined by the cup. A familiar modern ritual—steeping leaves and pouring off the liquid—is one way to use the plant, not the only way its stimulating contents can reach a person. With no kettle at hand, the leaves themselves could serve as the delivery system.
