In a large bowl, dissolve yeast in water with sugar. Let stand until foam appears.
Add salt, sourdough starter and flour. Mix approximately 5-10 minutes in mixer with dough hook or knead until a soft silky dough is produced. Let stand 5-10 minutes.
Divide into five equal parts. Wrap each individual piece in plastic and freeze or refrigerate at least overnight.
Thaw dough at room temperature. DO NOT KNEAD. Sprinkle with flour and stretch or roll to desired size.