Although in the 1400s Challah was a simple type of airy bread, as time passed traditional challah became known as the egg washed braided bread more common today.
Challah gets its name from the story of Moses and the tradition of burning a piece of the dough it comes from.
Challah is typically served in two loaves which is symbolic of the story of collecting double portions of food on Friday so as to not need to collect food during the Sabbath. The six strands between the two loaves are also symbolic of the six days before the Sabbath and the twelve humps of each loaf represent the twelve ceremonial loaves kept in the temple for the twelve tribes.
Typically the challah is covered with a decorated cloth until after the wine has been blessed
The families singing in "Sabbath Prayer" will wait for the matriarch of the family to begin prayers over the candles and challah. This will then be uncovered later on in the song to align with this tradition.
Appell, V.S. (n.d.) On Shabbat, why is the challah covered with a decorative cloth? Retrieved from: https://reformjudaism.org/learning/answers-jewish-questions/shabbat-why-challah-covered-decorative-cloth
Jewish Community Center. (n.d.) Challah Retrieved from: https://www.jccmb.com/templates/articlecco_cdo/aid/1419222/jewish/Challah.htm
Miller, A. (20 Jan 2017.) Why Do Jews Eat Challah on Shabbat? Retrieved from: https://www.myjewishlearning.com/the-nosher/why-do-jews-eat-challah-on-shabbat/
Modernist Bread. (n.d.) The Significance of Challah. Retrieved from: https://modernistbread.com/the-significance-of-challah/#:~:text=The%20term%20%E2%80%9Cchallah%E2%80%9D%20is%20applied,last%20through%20the%20Saturday%20Shabbat.
Posner, M. (2022.) Why Do We Cover the Challah Bread on the Shabbat Table? Retrieved from: https://www.chabad.org/library/article_cdo/aid/745995/jewish/Why-Do-We-Cover-the-Challah.htm
Reform Judaism. (n.d.) Why is it traditional to use two challot on Shabbat? Retrieved from: https://reformjudaism.org/learning/answers-jewish-questions/why-it-traditional-use-two-challot-shabbat