Vital wheat gluten is the high-protein flour from wheat used to make seitan and sausages and all sorts of fabulous wheat meats. I use Bob’s Red Mill Vital Wheat Gluten in all the recipes, and that seems to be the most common one on supermarket shelves. While we’re at it, you might want to know what seitan is. It was invented by monks in the mid-twentieth century by washing all the starch out of wheat. How did they figure that out? Who knows, but now we can eat amazing, chewy, grilled cruelty-free meat, so thank you!