I'm not jewish, but lately i found an interest in jewish traditions during passover.
There is a specific question that i asked myself: During passover, only unleavened bread should be eaten and this bread should only be made from five distinct grains. I tried to bake it for myself (only for myself, not to claim that it's a "true" unleavened bread).
Question 1: What's the idea behind this?
Question 2: Is it true that the identity of one of those grains is debated? I'd like to know which ones i could use, if i am allowed to :)