block bean curd (she doesn't say what kind

Block tofu, also known as bean curd cake or doufu in Mandarin Chinese, is a processed soy product made by coagulating soy milk and pressing the resulting curds into solid blocks. Originating in China over two thousand years ago, the ingredient spread throughout East and Southeast Asia, becoming foundational to numerous regional cuisines. The coagulation process typically uses gypsum (calcium sulfate) or nigari (magnesium chloride), which affects the final texture and nutritional profile. Block tofu varies significantly in firmness, from silken (soft, custard-like) to extra-firm (dense, crumbly), depending on the amount of water pressed out during production. The flavor is mild and neutral, allowing it to absorb surrounding seasonings and ingredients readily.

The most common variety in Western markets is firm or extra-firm block tofu, characterized by its pale white color and dense, slightly porous structure. These blocks typically measure 3-4 inches on each side and weigh 12-16 ounces, though sizes vary by manufacturer and region.

Block tofu is versatile in both savory and occasionally sweet applications, functioning as a protein base, textural component, or sauce-absorbing vehicle. In Chinese cuisine, it appears stir-fried with vegetables and aromatics, in mapo tofu (spicy Sichuan preparation), and in soups. Japanese kitchens employ it in miso soup and agedashi tofu (deep-fried and sauced). Korean cuisine features it in jjigae (stews) and grilled preparations. Southeast Asian cuisines incorporate it into curries, stir-fries, and braised dishes. Block tofu's neutral taste and ability to take on surrounding flavors make it particularly valuable in plant-based cooking. Firm varieties hold their shape during cooking and benefit from high-heat methods like pan-frying, grilling, or deep-frying, while silken varieties suit gentler preparations like steaming or use in dressings.