Taking Challah

From every batch of dough containing 1.25 Kg (2 lbs. 10 oz.) of flour or more, one must take 'Challah', i.e. take a small portion of dough and say 'Harei Zeh Challah'. On dough larger than 2.25 Kg (5 lbs.), the following Brocho is recited. Baruch Ata Ado-nai Elo-Heinu Melech Haolam Asher Kideshanu BMitvotov VTzivanu LHafrish Challah Min Haisa. (Blessed are You Hashem Our L-rd, King of the Universe, Who sanctified us with His commandments and commanded us to separate Challah from the dough.) One must then take Challah. The separated pieces should be placed in a marked receptacle. All the pieces must be put in a special container to burn. Should it not be possible to burn the 'Challah' then it should be double-wrapped and discarded.