Mozzarella cheese, fresh tomatoes and rosemary top this Sourdough Focaccia recipe. Delicious homemade Sourdough Focaccia with a crunchy golden bottom is topped with shredded cheese, fresh tomatoes, and fresh herbs for a delicious homemade flatbread recipe appetizer that can be dipped in a homemade olive oil bread dipping sauce. Great snack or meal that uses your sourdough starter.