Plain Tofu

The tofu spectrum ranges from ethereal to robust. Silken tofu, unpressed and custard-smooth, is coagulated directly in its container without being cut or pressed and comes in soft, firm, and extra-firm grades—ideal for blending and delicate dishes. Regular block tofu is pressed and categorized by water content: soft tofu retains the most moisture with a tender, almost wobbly texture; medium-firm offers versatility; firm tofu holds its shape for stir-fries and pan-frying; extra-firm and super-firm contain the least water, yielding dense, chewy blocks perfect for grilling and achieving crispy textures. Specialty varieties include smoked tofu, five-spice pressed tofu, fermented tofu (furu), and yuba (tofu skin)—the delicate sheets that form atop simmering soy milk.

Tofu's origin story is steeped in legend and scholarly debate: tradition places its birth in Han Dynasty China over 2,000 years ago, but the earliest reliable written record, Tao Gu's Qing Yi Lu, dates only from the 10th century. The most enduring tale credits Prince Liu An of Huainan (179-122 BCE), who allegedly discovered tofu by accident while attempting to concoct an elixir of immortality. According to legend, he inadvertently dripped gypsum or nigari into soy milk, causing it to coagulate into the first bean curd. Huainan in Anhui province, seat of his kingdom, still claims the title "Hometown of Tofu." Whether myth or history, tofu rapidly became a dietary staple across China, celebrated by Song Dynasty poets like Su Dongpo, who invented his own preparation called "Dongpo Tofu." The ingredient traveled to Japan during the Nara period (710-794 CE), where it became integral to Buddhist temple cuisine, and spread throughout Southeast Asia alongside Buddhist vegetarian traditions. Tofu was described by European travellers from the 17th century and made in Western immigrant communities from the late 19th century, but only in the late 20th century did it turn from an exotic curiosity into a global protein phenomenon.

The transformation of soy milk into tofu is a masterclass in protein chemistry. Soybeans contain two major storage proteins—glycinin (11S) and β-conglycinin (7S)—which form the structural foundation of tofu. The process begins when soaked, ground soybeans are heated to denature these proteins, making them susceptible to coagulation. When a coagulant is introduced to the hot soy milk, its salts or acid neutralise the charges on the already-unfolded proteins, allowing them to aggregate into a three-dimensional gel network that traps water, fats, and other components. The choice of coagulant profoundly influences the final product: calcium sulfate (gypsum) produces a smooth, tender curd with high calcium content; magnesium chloride (nigari, derived from seawater) yields a slightly sweeter, more delicate tofu with a subtly bitter finish; glucono delta-lactone (GDL) creates the silkiest texture with a faint sourness, ideal for silken varieties. The ratio of 11S to 7S proteins in the soybeans themselves affects firmness—higher 11S content produces harder tofu at lower coagulant concentrations. Pressing expels whey and concentrates the protein matrix, determining the final texture from silken to super-firm.

While tofu itself carries a significantly lower environmental footprint than animal proteins, the ethics of soy production warrant consideration. The vast majority of global soy cultivation—about three-quarters—feeds livestock, not humans directly. Tofu destined for human consumption represents a small fraction of soy production and is often sourced from dedicated, higher-quality crops. However, concerns about deforestation, particularly in South America, and GMO cultivation practices have prompted many conscious consumers to seek certified organic tofu carrying the EU organic leaf, made from European-grown soy. North American and European organic soy farmers increasingly offer traceable, deforestation-free options. When possible, choose brands that transparently disclose their soybean origins and farming practices. Organic certification excludes genetically modified soy and prohibits synthetic pesticides, while some producers now participate in sustainability verification programs that guarantee responsible land use.