What Happened at the Last Supper? A Textual Problem in Luke

A couple of days ago a reader asked me a question in connection with something I had said about the early second-century Christian text, the Didache, and its instructions about how the Lord’s supper was supposed to be celebrated.  Here is what I said:

“When they celebrate the Eucharist they are first to bless the cup with a prayer that the author provides and then to bless the broken bread, with another set prayer (9:1–4). This way of celebrating the Lord’s Supper by starting with the cup and...