Sour dough bread is made by making what is known as a
'starter' this is a flour and water mixed to form a soft,
slack dough and leaving it for a week prior to requiring
the bread. This 'starter' is used as the rising agent
and was the basis of breads for 100's of years in many
cultures. It uses the naturally yeasts found floating
in the air, that are captured by the starter dough.
Lost to many countries over the years with the advent
of yeast, it is now again making a comeback. Although,
as many countries that lost sourdough breads there were
others that maintained and embraced the loaves. Maybe
it was for the cultural signifigance, maybe the traditional,
maybe it was the exceptional taste of the loaves over
yeast breads. Whatever the reason sourdough breads are
back with us in am ever increasing big way, which this
chef is more than pleased with.