Science says the perfect cup of tea includes salt and lemon, leading to a hilarious argument between US and British Embassies. Despite tea possibly being first consumed in China as early as 4,000 years ago, the classic beverage has long been a staple of British culture and identity. This week, a US scientist has claimed that the perfect cup of tea needs salt and lemon, leading to a hilarious argument between US and British Embassies online. US scientist says the ‘perfect’ cup of tea should use salt and lemonWhilst Americans may have been enjoying salty British tea since Boston 1773, a new book…