In respect to this, can vegetarians eat rennet?
Rennet is an essential element of the cheesemaking process and is used to coagulate, or thicken, milk into curds. The use of animal rennet to make cheese can be a problem if you're a vegetarian. Although it is less common, vegetarian-friendly cheese made from rennet derived from plants or microbial rennet is available.
Subsequently, question is, are calves killed to make rennet? From animal stomachs.Most stomach-derived rennet is taken from the fourth stomach of young, unweaned calves. These animals are not killed expressly for their rennet; rather they are killed for meat production (in this case, veal) and the rennet is a byproduct.
Considering this, why is Parmesan not vegetarian?
Parmesan, which takes its name from the three places it's made (Parma, Reggio Emilia and Bologna), is not vegetarian because its production involves the killing of animals. And Parmesan is not the only cheese to contain calf rennet. Grana Padano and Gorgonzola are other Italian cheeses with rennet in the recipe.
Why is pesto not vegetarian?
Pesto. If it doesn't specify it's veggie, it's likely to contain our old meaty friend, Parmesan. Most traditional pesto recipes and shop-bought jars won't be suitable for vegetarians. It's often safer and simpler to whizz up your own sauce using a vegetarian Parmesan alternative.