Summary: it tightly with plastic wrap Allow it to ferment for 1 hour or up to 4 hours at room temperature During this time the sponge will bubble through the flour blanket in places This is fine 4 Mix the dough Add the butter and mashed potato With the dough hook mix on low speed 2 Kitchen Aid for 1 minute or until the flour is moistened to form a rough dough Scrape down any
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