Forget sourdough pancakes, which often turn out gummy. These crepes are a much better vehicle for using up discarded sourdough starter. Tender and a little bit tangy, they make an ideal blank canvas for sweet or savory toppings. Be patient when you start to cook them, since just like pancakes, the first crepe is never the best. If the initial ones are too pale (or burnt!), simply adjust the heat and keep going until you reach a sweet spot!