The curds and whey are separated using rennet, an enzyme complex normally produced from the stomachs of newborn calves (in vegetarian or kosher cheeses, bacterial, yeast or mould-derived chymosin is used) [REF].
"Cheddaring" refers to an additional step in the production of Cheddar cheese where, after heating, the curd is kneaded with salt, cut into cubes to drain the whey, and then stacked and turned [REF].