I read all the time about people cooking with sesame oil, but I've heard a number of times on cooking shows that it's not really a cooking oil, but rather more of a condiment. Are there two kinds of sesame oil? We were at an Asian market and we saw little tiny bottles of it and big one-gallon cans of it, so I wasn't sure if maybe there were different kinds. We have a small bottle in our pantry, but I'm unsure as to how to use it. Thanks!