cashel blue is a hand-made, semi-soft, mildly blue veined and slightly acidic blue cheese with a creamy texture, made from cows milk. over half the milk used in the production of cashel blue comes from their own farm, with the rest sourced from farms located nearby. the cheese was named after the rock of cashel overlooking the pastures close to the farm. it has large blue flecks, made by the action of "penicillium roqueforti", the same fungus used in roquefort, stilton, and other blue cheeses.