Sea Cucumbers from Korea

My wife asked me to buy sea cucumber.  I asked the concierge and guess what! Namdemoon is walking distance from the hotel.  So I wander about to check it out.  There is a Chinese grocery store and indeed the boss was weighing and packing the dried sea cucumbers.  The price was pretty good.  So I bought 2 packs of 600gms which is one catty in the old measurement.  The sea cucumbers are huge when they re-hydrates.  So The Wife is pretty happy with the purchase.  Today, we ate some for dinner.  It is very tough.  So she need to braise them instead of quick boil.