Protein sources Protein content (grams/ 100 gram foood)
Mushrooms, raw 3.09
Broccoli, raw 2.82
Cake, boston cream pie, commercially prepared 2.40
Mung beans, mature seeds, sprouted, cooked, boiled, drained, without salt 2.03
Puddings, rice, ready-to-eat 2.00
Pie, cherry, commercially prepared 2.00
Puddings, tapioca, ready-to-eat 2.00
Cauliflower, raw 1.98
Kale, cooked, boiled, drained, without salt 1.90
Pie, apple, commercially prepared, enriched flour 1.90
Beans, snap, green, cooked, boiled, drained, without salt 1.89
Beans, snap, yellow, cooked, boiled, drained, without salt 1.89
Potatoes, boiled, cooked in skin, flesh, without salt 1.87
Cauliflower, cooked, boiled, drained, without salt 1.84
Cereals, QUAKER,Instant Oatmeal, apples and cinnamon, prepared with boiling water 1.82
Pie, blueberry, commercially prepared 1.80
Bamboo shoots, canned, drained solids 1.72
Potatoes, boiled, cooked without skin, flesh, without salt 1.71
Cereals, QUAKER, corn grits, instant, plain, prepared with water 1.61
Cabbage, chinese (pak-choi), cooked, boiled, drained, without salt 1.56
Mushrooms, shiitake, cooked, without salt 1.56
Beans, snap, green, frozen, cooked, boiled, drained without salt 1.49
Beans, snap, yellow, frozen, cooked, boiled, drained, without salt 1.49
Blackberries, raw 1.39
Sweet potato, cooked, boiled, without skin 1.37
Lettuce, butterhead (includes boston and bibb types), raw 1.35
Parsnips, cooked, boiled, drained, without salt 1.32
Plantains, raw 1.30
Sweet potato, canned, syrup pack, drained solids 1.28
Cocoa mix, with aspartame, powder, prepared from item 14196 1.26
Pumpkin, canned, without salt 1.10
Plums, dried (prunes), stewed, without added sugar 0.96
Soup, cream of mushroom, canned, prepared with equal volume 0.95
Carrot juice, canned 0.95
Sauerkraut, canned, solids and liquids 0.91
Tomatoes, red, ripe, canned, stewed 0.91
Soup, vegetarian vegetable, canned, prepared with equal volume water, commercial 0.87
Tomatoes, red, ripe, canned, whole, regular pack 0.80
Orange juice, chilled, includes from concentrate 0.80
Cucumber, with peel, raw 0.65
Papayas, raw 0.61

Data adapted from: USDA nutrient database for standard reference, release 18.

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For characterization of protein from animal nutrition perspective, please read this article: Crude Protein: CNCPS.