In a large mixing bowl, dissolve the sugar in the warm water. Stir in and dissolve the yeast, and then mix in the sourdough starter and 1 cup of flour. Let this sit for a few minutes, until the mixture begins to bubble.
Add the dry milk, butter, salt, sour salt (if you're using it; it's a nice flavor-booster) and a second cup of flour, and beat well. Add 5 to 6 cups of flour, one cup at a time, to form a dough that holds together and pulls away from the sides of the bowl
Turn the dough out onto a lightly floured surface and knead it until it's smooth and springy, but slightly on the slack side, about 8 minutes. Add flour only as necessary to prevent sticking. Clean out and grease your bowl and place the dough in the greas
* When the dough has risen your chosen length of time, punch it down, turn it out onto a lightly floured work surface, cover it and let it sit for a few minutes (to relax the gluten). Divide the dough into two pieces and roll each piece out separately to
Carefully transfer the rounds (as many as a time that will fit without crowding) right-side up to a large electric griddle preheated to 350°F, or to an ungreased frying pan that has been preheated over medium heat. Cook them for about 10 to 12 minutes on