If you decide to add raisins, soak raisins in the cup water to sweeten the water a little.
Mash bananas in large bowl. Crumble up the matzah on top of the bananas. Add in the cup of water (from raisins or tap). Mix well until the matzah has soaked up most of the water. Add raisins if desired and mix.
In 8-9 inch skillet on medium heat melt enough margarine to lightly coat the pan. Pour in the mixture and pat down for about 4-5 minutes or until it is holding together. Flip by covering the skillet with a plate or something else that is flat. Add a little more margarine. Return the Matzah Brei to the pan for another 4-5 minutes. Enjoy!