Hey Owlie, are you sure it's the protein and not the fat or total calories you're missing? This sounds like a typical dinner for me, but when it's lean chicken or fish I have to compensate with a "lot" of fat, like oil dressings. I don't worry about it much as long as it's healthy fat and I can burn it off.
I don't have any absolute rules, but try to eat somewhat ethically and eco-friendly, without going vegetarian. I don't like mushrooms or fungi, and would prefer to not eat anything with an exoskeleton or anything that looks at me off the plate

but in polite company I'll eat just about anything I'm served.