most of the time the receipe says bring to a boil then reduce heat to simmer ....but, what if the receipe says bring to a boil and reduce heat to medium and simmer. Does the above beginning statement(bring to to a boil then reduce heat to simmer)mean to drop to a low or medium simmer? How is one to determine what to drop to. You can have a low simmer and a medium simmer,am I correct in this? THX