Pizza seasoning, sesame seeds, artisan bread topping, or anything else you think might be good; all optional
If you feed your sourdough before using, the loaves will rise better; but if you're in a hurry, unfed sourdough will simply lend its flavor, while the yeast in the recipe takes care of the rise.
The Ascorbic acid gives a nice little "bite" of sour dough flavor. I order mine online.