'Son in Law' may sound like an unusual name for a restaurant, but the name is steeped in Thai culture. Son-in-Law eggs are a Thai street food favourite - fried hard boiled eggs in a tamarind sauce. But why are they called Son-in-Law eggs? My research suggests that it relates to the fact that the Thai word for 'egg' is the same as the word for... how shall we put it?... the part of male genitalia that comes in pairs! If a mother feels her son-in-law is not treating her daughter as he should, she will cook and serve Son-in-Law eggs to him. So, it serves as a warning to him to improve his behaviour or risk losing that important part of his anatomy.