Y-Fenni takes its name from the Welsh town in which it is made, and a town which is more often referred to as Abergavenny by the English. Each cheese is made from mature cheddar cheese blended with whole-grain mustard and Welsh ale. Pasteurised cows' milk is used. The mixture is then pressed firmly into moulds and then coated in a pale yellow wax. It has a full tangy mustard flavour, moist texture, pale-yellow colouring speckled with the mustard grains.