A nasty quarrel arose in the 11th century over what kind of bread ... in holy communion. The view in Constantinople was the bread for the eucharist must be sourdough. But in Rome, an unleavened ...
Canon B 17 of the CofE states that communion wine should be 'the fermented juice of the grape, good and wholesome' and the bread 'whether leavened or unleavened, shall be of the best and purest ...