This is a very good starting point: https://www.youtube.com/watch?v=46wFhxCbI6w

The vast majority of our protein comes from lentils, pulses, and beans. But not all of it is just stew.

A very tasty treat that actually tastes better than meat and would do well at a 4th of July cookout or bbq is something called 'soya chaap'. Not exactly healthy, but high in protein. Myriads of recipes on youtube.