After one week away from home, I miss my sourdough starter. I leave him for a week in the fridge and It grows pretty well. Today I am going to use it to bake peanuts filling bun. Let me make a try with one week sourdough starter. Before using it, I removed some out and feed it with fresh flour and water. It will be too sour for buns if I use one week old sourdough starter. I fed the sourdough starter for two hours in room temperature. I mix it with the rest ingredients. I left it overnight in the fridge for cold fermentation. Notes. For cold fermentation in order to avoid the dough dry out, I covered the bowl with wet towels and placed the bowl in a plastic bag.