Jack Sturgess March 16, 2017 Bread Tip 28 - Poolish? Biga? Sponge? What is a preferment? Jack Sturgess March 16, 2017 Whatever you want to call it, a preferment is a pretty simple thing. It's just time in a bowl, and NOTHING brings as much good stuff to your bread as time does. Got it? Try a preferment, make mySuper focaccia get the recipe