Chia seeds - This complete source of protein contains around 2 g of protein per tablespoon.
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Tofu - This versatile soy product contains about 10 g of protein per ½ cup.
Lentils - This edible legume contains around 9 g of protein per ½ cup when cooked.
Chickpeas - When cooked, chickpeas contain around 7 g of protein per ½ cup.
Quinoa - This grain is high in protein, containing around 4 g per ½ cup.
Peanuts - Peanuts contain around 21 g of protein per ½ cup.
Almonds - Almonds contain around 17 g of protein per ½ cup.
Mushrooms - Five medium mushrooms will provide you with roughly 3 g of protein.
Spirulina - One tablespoon of this blue/green algae contains around 4 g of protein. It can be bought online, and consumed as either a powder or supplement.
Ezekiel bread - One slice of this alternative to traditional bread will give you 4 g of protein.