Sourdough Starter
Your sourdough starter is a living breathing thing, think of it as a live active yeast that you can use to make food taste even better! At one point in time, someone created it by mixing flour and water, letting it sit out on a warm counter, splitting it in half, feeding it more flour and water, etc. until a bacteria became alive in it which makes that sour smell of sourdough bread. Sounds gross - tastes great!