A common kind of concern that is there about vegetarian and vegan diets is that that they may lack sufficient protein. Vegans could get proteins from various plant sources, and even some are better than the others.

Seitan

Seitan is a popular choice of protein for many vegetarians. It is made from gluten, the main protein is wheat. Unlike many soy based mock meats, it resembles the look and texture of meat when it's cooked.

Tofu, tempeh, and edamame

Tofu, tempeh and edamame is originally from soybeans and they are especially popular in East Asian Cusine. Soybeans ate considered as a whole source of protein. This means that they provide your body all the essential amino acids when it needs.

Lentils

Lentils are a great source of protein, with almost 18 grams of protein per cooked cup is a good amount of protein.

Beans

All the varieties of beans are extremely important staple foods that's across the cultures and they contain high amounts of proteins per serving.

Green peas

Green peas contains over 9 grams of protein per cooked cup (160 grams), which is slightly more than a  cup (237 ml) of dairy milk.

Sources: https://www.healthline.com/nutrition/protein-for-vegans-vegetarians