@trishanna, since we CKD folks also have to limit phosphorus, potassium, and sodium, it's tricky to get enough protein even if you also are on a protein restriction as I am. And as I'm "almost" vegan and seldom use any animal products except eggs it can be challenging to find acceptable protein sources which aren't too high in the other minerals we must monitor.
Native Americans combined what is called the Three Sisters, corn, squash and beans to make complete proteins. Since dried beans also can be high in phosphorus and potassium I have to limit them and use green beans instead of dried beans and summer squash instead of higher phosphorus and potassium hard-shell squash. They did use sea salt but not a lot of it and chose other seasonings such as animal fat (not for vegans) and hot peppers, wild onion/wild garlic and other greens.
Similarly, peas and rice form a complete protein. 1/3 C Water Maid rice = 57.4 cal 22.7 mg P 18.5 mg K 0.5 mg Na 2.8 Gm prtn and ½ C snow peas has 60.4 cal 73.4 mg P 138 mg K 2.9 mg Na 2 Gm prtn
@fiesty 76 posted a link for good sources of protein but here again, many of them are relatively high in phosphorus and/or potassium. My personal answer has been to purchase Morning Star Farms and Gardein meat analogs despite the fact that these are highly processed foods. I do think they are safe for me in moderation. 3 Morning Star chicken nuggets have 9.8 Gm protein and 1 Gardein "fishless" fillet has 4.5 Gms protein. 1 MSF "sausage" link is 40 cal, 64 mg P, 25 mg K, 150 mg Na, <2.3 Gm prtn. A King's Hawaiian slider bun has 3 Gms protein and is relatively low in phosphorus, potassium and sodium as long as I watch other sources of those in my daily meals.
Corn itself has a fair amount of protein; 1 small homemade cornmeal tortilla has 2.2 Gm protein. 2 Azteca Tac Size Flour Tortillas have 170 cal, 119.1 mg P (est), 139.5 mg K (est), 360 mg Na, 4 Gm prtn and. 3 T canned mushrooms with no added salt are 25.5 cal, <153 mg P, <153 mg K, 22.5 mg Na, 4.2 Gm protein and 3 of their corn tortillas have 3 Gms protein..
Tofu also is a good source of protein; 1 block extra firm Mori-nu silken tofu (349 Gm) has 180 cal, 250? mg P, 516 mgK, 160 mg Na, 28 Gm prtn! Of course you wouldn't consume a whole block at a meal, it is so versatile and small amounts can be used for taco filling, breakfast scramble, etc. 4 T fat-free refrid beans has 3 Gm protein but it also has 235 mg sodium so moderation is the key here. 1 serving of skillet bread (recipe in my almost vegan cookbook) has 3.7 Gms protein but is low in phosphorus, potassium, and sodium. Although heat can lower nutrient value, ¼ C grits before cooking has 130 cal, 28.6 mg P, 53.8 mg K, 0 mg Na,3 Gm prtn.
The values given above can change as manufacturers alter their recipes and ingredients and amounts so it's always wise to read the labels.
Hope this helps.