Yeah, that's why I don't go vegan or vegetarian. I doubt I'll get enough of some nutrients that are easy to get from meat. I've cut out most of my dependency on the beef industry, though even that has been difficult to get to 0 and probably won't because I don't see myself ever being willing to give up cheese. So far, no alternative I've tried has come close enough.
But an Indian vegetarian dish, dol (dal?), has become a regular dish in my home. It's mostly lentils and spinach but it's really good, even my daughter loves it. Plus it's really easy to make a giant batch of to freeze leftovers.