back in the 60s i think, the book "diet for a small planet" was published, which was one of the first that really tried to scientifically come up with good plant protein sources that could be used by the human body.l My daughter stopped eating meat about 15 years ago, and while she lived at home,a nd when she visits, i have to cook for her,and i got "laurel's Kitchen" whicgh is an even better book from the scientific point of view. The point of these books is that humans can't use the protein from vegetables as they are because they are not the complete molecule strands that we need and we don't have the digestive systems to make them up (like cows, for instance). However, if you eat combinations of semi-proteins from vegetable sources, in the same meal, you will digest fully useable protein.
legumes and grains (pasta and fagioli, pasta and ceci (chickpeas), lentils and rice, rice and peas, lentils and bread, or any combination of those - grains being wheat, barley, rice, corn, etc)
grains and seeds (bread with sesame, hummus (chickpeas with sesame paste), falafel (same), etc
grains or legumes with milk or egg (pasta with grated cheese, bread and cheese, polenta with cheese, or basicallyany dish with a small amount of milk product or egg, mixed with a large quantity of grain or legume) (Of ncourse milk and egg are already fully usable protein but you don't need as much)
Naturally, insofar as you can, use whole grains for more protein.
also other vegetables have a discreet amount of protein which, in combination with other foods, gives you the complete protein of meat. (pasta with broccoli, for instance) Anyway, if you're not actually still growing you don't need all that much protein.
Fortunately, since most people were too poor to eat meat for most of history, peasant food of all countries is full of plenty of great recipes. Mostlty i know the italian versions, since i live here. I can give you plenty of recipes, just ask.
PLEASE DON'T BUY THAT AWFUL FAKE MEAT - it doesn't taste like meat anyway, and has a creepy texture and is basically an industrial product.
You'd be surprised how full you feel after a nice dish of pasta and fagioli.
"Siduri said, 'Gilgamesh, where are you roaming? You will never find the eternal life that you seek...Savour your food, make each of your days a delight, ... let music and dancing fill your house, love the child who holds you by the hand and give your wife pleasure in your embrace.'"