Question: What is Vegetarian Rennet?
Rennet used in cheesemaking traditionally comes from animals. Specifically, the stomach lining of young animals that have been butchered. This can be a problem if you are a vegetarian who eats cheese.
Answer: If you are vegetarian, look for cheese made with microbial rennet or made with rennet derived from plants. Typically, plant-based rennet for cheese comes from thistle. Microbial rennet is usually fermented from bacteria but can also be genetically modified. For guidance, consult this list of artisanal cheeses made with vegetarian rennet.