It may have a protein content of about 7.5 to 13.0% (based on the weight of the flour, which is assumed to contain 14% moisture by weight) and an acid viscosity value in the range of about 60??? to 90??? M. A sponge may be produced by combining the flour, water, yeast, bacterial source, and flavoring ingredients, such as cheese, in a mixer, such as a spindle mixer or upright mixer.