Seitan, sometimes know as wheat protein, is very popular in the East. It is basically whole-wheat flour without the starch, leaving just the wheat gluten. Most of the veggie meat substitutes are made from wheat protein, but have a lot of sodium and other extra things added in for "flavouring" which alters the nutritional content of this food. Homemade seitan is super easy, very cheap and you can choose what flavours you want to add.
Nutritionally, this Seitan recipe has 28g of protein per 30g serve and 1g fat. I do not add salt in but I cook the seitan with dulse or kombu seaweed for it's iodine content and flavour. Miso also works well.
Seitan keeps in the fridge for a week. You can use in stews, stir frys, anything really. It definitely has a meaty texture so makes a good meat substitute.
HOMEMADE SEITAN RECIPE: