Fu is a dried wheat gluten often used in Shojin Ryori temple style cuisine as a meat alternative. Fu soaks up cooking liquid really well so is great to use in hotpots. kuruma is the name for car or wheel in Japanese and these fu are so called because of their shape.
They can also be used as something called Shojin steak . If you buy these organic Ohsawa kuruma fu they come with a recipe card with ideas on how to use it .