Did you know that sourdough starter can be used as a tangy thickener for liquids like gravies, soups, chowders, stews, and sauces? The process is very simple, almost like a reverse roux. Sourdough Starter Thickening Process Instead of starting with flour and butter like you would for a traditional roux, you start with a room-temperature liquid … The post Sourdough Starter Gravy appeared first on Butter For All.