Author Howard Hageman addresses some of those questions.
What Do We Serve?
We must begin by determining what the eucharistic elements are in Reformed practice. Of course, everyone realizes that by New Testament example they are bread and wine, but that simple statement requires a good deal of further definition. Christians from various traditions have developed different ideas about what is appropriate to the Eucharist, or Lord's Supper.
This resource was originally published in Reformed Worship by Howard G. Hageman.