Right before we begin Shabbat dinner, two uncut loaves of challah are uncovered. As they are raised, the following blessing is recited. After the blessing, the challahs are cut or torn into pieces which are distributed to everyone present. Some people lightly salt their piece of Challah before eating it, comparing it to a divine offering from temple times.

Baruch ata Adonai, Eloheinu melech haolam, hamotzi lechem min ha'aretz.

Praised be our Eternal God, Ruler of the universe: who brings forth the bread from the earth.

Service Section: Kiddush, Motzi & Handwashing 
Source: moishe House