These little bites are made a seitan, a meat substitute made from a protein called vital wheat gluten. You can find it in health food stores or online and it comes as a flour which you make into a dough. Here I've deep fried little pieces of it and then coated them in a hot-sweet sauce made with a Korean fermented chilli paste called gochujang - many brands of it are vegan but just check the label to make sure!