Wash the shiitake mushrooms before using.

Put all the ingredients in your Instant pot and cook on high pressure for 60 minutes.

If you don't have an instant pot you can either cook on a low heat on the stove for about 2 hours. It might take more time as well depending on the shanks you have.

But once the meat is fork tender it's done.

Alternatively you can bring it to a boil on the stove and then pop into the oven for about 3-4 hours at 170 C

Once your beef is cooked let the instant pot release naturally before opening the lid.

Pull out the beef pieces and the mushrooms

Then strain the stock.

Enjoy. Use it to make sandwich filling or a curry. Both recipes are linked in the text above.