What is "eringo"

Usage examples of "eringo".

She did, and she was particularly delighted to receive a box of eringo root which was one of the products of the town.

Tasting this she found it to be a delicious sweetmeat and Lord Harcourt explained to her that the sweets were made from the roots of the eringo which was a kind of sea holly, and it was the custom of the inhabitants of Colchester to give boxes of this sweetmeat to members of the royal family who honoured their town by visiting it.