Duerr’s blackcurrant fruit spread is delicious on scones, toast, and muffins. Based in Manchester, Duerr’s is the oldest family-run jam maker in England. For this particular recipe, they use only the plumpest, juiciest fruit to create a concentrated conserve with a rich, intensely flavorful taste. Based in Manchester, Duerr’s is the oldest family-run jam maker in England.