Chhena Making — Acid Type and Texture Control (छेना बनाने की विधि)

Bengali and Odia dairy tradition primarily; chhena-based sweets (rasgulla, sandesh, rasmalai) are a Bengali invention that spread pan-India; the technique of acid-coagulated milk is documented in Bengali texts from the 18th century

Chhena (छेना, also chhana) is fresh milk curd — the soft, warm, loose milk protein mass created when acid is added to hot whole milk, causing the casein proteins to coagulate and separate from the whey. The acid type is where the texture lives or dies: lemon juice (the Bengali preference) produces a soft, moist chhena with slight citrus fragrance; citric acid (food-grade, powder form) produces a firmer, more neutral-tasting chhena; vinegar (white) produces a distinctly acidic-smelling chhena that transfers an unwanted flavour to delicate sweets. The correct technique requires bringing the milk to just below a full boil before adding acid, stirring gently, and draining through muslin.

Chhena is the building block — it is not eaten alone. Its freshness determines the freshness of every sweet made from it. Old or commercially stored chhena has a slightly sour edge that compromises delicate preparations.