Salad cream
Salad cream is a creamy, pale yellow condiment based on an emulsion of about 25–50 percent oil in water, emulsified by egg yolk and acidulated by spirit vinegar. it is somewhat similar in composition to mayonnaise and may include other ingredients such as sugar, mustard, salt, thickener, spices, flavouring and colouring. the first ready-made commercial product was introduced in the united kingdom in 1914, where it is used as a salad dressing and a sandwich spread. historically, salad cream, often mentioned in victorian sources, consisted of "hard-boiled eggs puréed with cream, mustard, salt and vinegar".
Source: Wikipedia
