Crusty loaves of San Francisco Sourdough Bread are ideal for making grilled sandwiches such as grilled cheese.   Whether it conjures up a crusty, flavorful loaf of bread, or a bubbling crock of flour/water starter, sourdough is a treasured part of many bakers’ kitchens. Sourdough bread is a type of bread that is made using naturally occurring lactobacilli and wild…