Should We Use Unleavened Bread in the Lord’s Supper?

Last summer while vacationing in Minnesota for a couple of days I happened to meet a Lutheran minister. After becoming acquainted somewhat, we fell to discussing matters of religion and theology, especially the differences between the Reformed and Lutheran branches of the Reformation. As could be expected, the subject of the meaning of the Lord's Supper came up, and along with that the question of the symbolism involved. My acquaintance volunteered the information that in some Lutheran churches...