Tartar sauce is first mentioned in French cookbooks from the 19th century as an accompaniment to beef tartare. At its core, tartar sauce is made out of mayonnaise mixed with pickle relish. All recipes and versions of tartar sauce are simple variations on this main theme.
The origins of malt vinegar in Britain go back several hundred years. As Britain is a beer-drinking nation, the early vinegars were simply beer that had turned sour; it was left and encouraged to acetify completely, and then processed, packed and sold in the area around the local beer brewery.
Don't like malt vinegar? Go with beer on the side.