I don't really understand the rules of Passover. You're not supposed to eat leavened bread, i.e. no yeast can be involved in the process. Okay, that's fine. But then I can't have something like rice (which is just hydration) or popcorn (which is just evaporated water expanding). For that, the idea is those grains weren't known to ancient Israel, so it's best not to eat them at all in case the ancient Israelites would've imposed a ban on them. But the idea at the end of the day is still leavened bread; the whole point of the holiday is to experience the suffering the Jews felt as they fled from Egypt. If you're telling me it's okay to spend hours baking a cake and that passes because it rises using air bubbles and not yeast, but soaking rice grains is not on the off chance it would've offended the sensibilities of a people three thousand years ago, I think you're missing the point.