Frozen sea squirts: any suggests on cleaning/preparing?

I bought a pack of frozen sea squirts from Korean market. They are quite small - 3-4 cm long creatures. I dug all possible recipes about sea squirts, but all of them are about either alive or dried sea squirts. Can you please recommend how to clean them and prepare for cooking?

My current idea is to unfreeze them, wash intensively, and ultimately cook (uncut) in a medium intensity sauce for 10 minutes.