Its tartare btw...
It is usually not seared at all. Typically served cold, cut into chuncks and mixed with produce and a dressing that complements it well.
In terms of seared tuna. My reccomendations:
-use a cast iron pan, conducts heat better and much more evenly.
-use a fat (oil) that has a high smoke point (not extra virgin olive oil, perhaps grapeseed oil or canola oil). Make sure oil is very hot before placing tuna in pan.
-do not try and flip the tuna while in the pan until it naturaly "lets go" of the pan (it usually lets go once it gets a perfect sear). If you try too early, you will just tear the flesh and not get a quality sear.
Im not sure exactly what your were having trouble with, but those are some basics. Hope it helps.
Also, tuna is a very safe fish to eat raw or rare provided you gt it from a reputable source. There is an extremely low rate of bacteria/harmful organisms found within fresh tuna.
<message edited by megaman77 on Thursday, April 03, 2008 10:18 PM>