From The Monthly Chronicle of North-Country Lore & Legend, May 1891:-
2nd April – At a wedding which took place at Whitburn Parish Church, a curious and very ancient custom was observed. What were described as ‘hot pots’ were brought by several of the residents of the village, and, as the party were leaving the church, the bride and bridegroom were invited to taste the liquid contained in them. The mixture consisted of various ingredients, and looked and tasted something like brewers’ yeast. The villagers claimed that the custom prevailed only in Whitburn, and that it was so ancient that the origin of it could not be traced.