Passover - Shalom
I'm not Jewish, but Christian. Some friends introduced my wife and me to Passover years ago and we've celebrated it ever since.
Matza or Matzoh or "Unleavened Bread" or "Bread of Affliction" are crackers made with flour in an environment that yeast wouldn't ever have time to leaven it.
This is about 18 minutes from the time the grain is ground to flour (or touches water) to the time it is placed in the oven.
It's called "Bread of Affliction" because it is the last thing the Hebrews ate as they left Egypt; it is the final token of the affliction and bondage they had been subjegated to.
As unleavened bread it represents a lack of sin. I find this interesting on so many levels.
Consider how leavening makes bread rise; it makes it plyable; it permiates the entire ball of dough.
In contrast, lacking leaven tends to make bread tough, dogmatic, strong, solid.
Passover has so many symbols, textures, sights and smells that it easily ignites one of the greatest stories of all time into higher levels of meaning.