Flavored vodkas have to be kosher certified.

WSJ: 'Because God Says So'

Religious Jews buy only kosher-certified products and they separate their meat and dairy foods.

BBC: Hunting for hummus in Israel

"It is much better than it used to be, " says Rabbi Fishbane, but "it is not certified glatt, " he says, referring to an even higher standard of kosher meat certification.

WSJ: As Passover Nears, These Rabbis Are Getting Out Their Blowtorches

For Hebrew National to be certified as glatt, Rabbi Fogelman says, it would have to use only glatt kosher meat.

WSJ: As Passover Nears, These Rabbis Are Getting Out Their Blowtorches