What are some vegetarian alternatives to Parmesan? I would like something that tastes the same, but does not use products obtained by slaughtering animals, such as animal rennet.
Here are several options for a cheese-like flavor with vegan substitutes:

1) Q'or: made of ground cashew nuts, nutritional yeast and garlic powder, this is similar in taste profile to parmesan cheese! You can also mix it into pastas or rice dishes for added flavor.

2) Tofutti shreds: these thick coconut cheeses work well as a substitute for parmigiano reggiano in pasta sauces, lasagna, salad dressings, soups and more. They're very deliciously cheesy but non-creamy, so if you prefer creamier cheese, they won't be ideal!

3) Nutritional Yeast & Garlic: This recipe gives an idea on how to make your own "cheese" using this product. It's quite versatile as it allows you to control exactly what goes into it (e.g. herbs/spices, salt etc.).