How do you cut the challah on Rosh Hashanah?

You don't cut challah, you never cut challah. It is torn and eaten. The reason is that challah is the bread of Sabbath, and a knife is an instrument of strife. In Micah 4:3, we are told that men will make plows of sWords and not learn war any more in the day of the Lord. Since Shabbat is the Day of the Lord, we don't cut the bread we use on that day.