Gluten or Seitan is the protein part of whole wheat flour. The traditional way of making it is to make a dough and then wash out the starch. With what is left, simmer in a flavored broth. It is pretty interchangeable with tofu in recipes such as stir fries. Slicing it into very thin pieces and sauting is also very yummy. I then use it in sandwiches. This is much less expensive than buying in the store and you can adjust the texture and taste to suit you. It also freezes well I understand.