Our family was first introduced to the concept of "rare" Ahi Tuna when my sister-inlaw opened an inland NJ seafood restaurant. Frequently, she tested new recipes on us as well as her family & friends. The first time I tasted it, I was surprised to find out how good the rare tuna was! I then decided to create my own marinade that was more to our liking. The trick is to just sear the fish on a hot frying pan for 1-2 minutes per side and then serve immediately.