In an 8 oz. measuring cup, stir together first 3 ingredients; let mixture
stand until it bubbles to top of cup. Dissolve baking soda in 1/2 Tbs.
warm water. In medium bowl, combine milk, salt and soda−water mixture
with 1 cup flour, beating with wire whisk until smooth. Beat in yeast
mixture and then remaining flour, using a sturdy spoon. Batter should
be thick and sticky but smooth, with all flour thoroughly dissolved. Put
dough in 2 small pie pans that have been sprayed with non−stick spray and
dusted with cornmeal. Cover with wax paper or plastic wrap that has also
been sprayed. Let rise about an hour.