Processed
Calf Rennet
S tier
Calf rennet is the old cheese-vat standard: chymosin-rich extract from the abomasum of unweaned calves, with a little pepsin that traditional makers count as part of the flavour story. It opens kappa-casein cleanly so a sweet milk gel can be cut into a cheddar, parmesan, or farmhouse tomme curd. Many PDO cheeses still require it or strongly prefer it to microbial coagulants. Strength is sold in IMCU or dilution ratios. A good liquid smells cleanly enzymatic, not rotten, and sets a test vat in the promised minutes. It is not vegetarian. Overdose gives a bitter, fast-ripening paste; underdose leaves a weak curd that shatters on the knife. Keep it cold.
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Characteristics
Preparations
Traits
History
Herders found that a calf stomach lining would set milk into a lasting curd.
Christian Hansen began commercial calf-rennet extracts, taking coagulation off the farmhouse hook.
Standardised calf rennet remained the reference coagulant for aged European cheeses.
PDO rules and farmhouse revival kept calf rennet in demand beside fermentation chymosin.