Salad cream 沙律酱 (忌廉)
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 may include other ingredients such as sugar, mustard, salt, thickener, spices, flavouring and colouring. It was introduced in the United Kingdom in the 1920s, where it is used as a salad dressing and a sandwich spread. Due to the higher cost of ingredients during periods of rationing in the United Kingdom a flavour similar to mayonnaise was achieved in the creation of salad cream.