In late 2019, Seamus Blackley, known as the father of the X-Box, and a keen sour dough bread baker and Egyptologist, made bread using a 4,500-year-old yeast, collected from ancient Egyptian ceramic pots once used for beer and bread making. Quite the achievement. While resurrecting dormant yeasts is not for everyone, there are certainly fans of keeping a dish going for a lengthy time, or keeping something alive and active for as long as possible. Take the perpetual stew for example. Dating back to medieval times, the stew traditionally consisted of whatever was to hand, with ingredients and liquid continually added before the stew was finished. The flavour was said to get better with age. The French pot-au-feu is another example – one concoction of the French national dish was allegedly kept bubbling from the 15th century until the second world war, and another for a mere 300 years. Is vegan kimchi more or less healthy than the real deal? Closer to home is Wattana Panich’s perpetual beef noodle soup dish that has been simmering for over 45 years. Located in Bangkok, the humble family run establishment has maintained the neua tune the traditional way. Reserving broth from the day’s batch to start the following day’s soup, balancing the flavour until it taste as it should. The secret recipe has been passed on orally for three generations. View this post on Instagram A post shared by (....) (@athipcyk) on Jul 27, 2020 at 10:42pm PDT There is also Chinese master stock, a stock that is continually used for poaching or braising, and is common in Cantonese and Fujian cuisines. Beyond Impossible? Cellular cultured meats only work for environmentalists A master stock varies from a stock in that it is not discarded or used for a sauce or soup. The aromatic liquid begins with a meat stock with the addition of soy sauce, rice wine and spices, such as star anise and cassia bark, continually becoming more flavourful and complicated over time, intensifying the flavour of the poached or braised ingredients in turn. With the correct care this type of stock, in theory, can be used indefinitely, with claims of master stocks in China being centuries old. View this post on Instagram A post shared by Kimberly Miller (@kimberthemiller) on Jul 14, 2020 at 6:10pm PDT When it comes to keeping it alive the current favourite is kombucha, with its “Scoby” – symbiotic culture of bacteria and yeast. It is formed after a fermentation process of lactic acid bacteria, acetic acid bacteria and yeast, and is vital in the creation or transformation of certain foods and beverages, including the tea-based drink kombucha. Is cooking oil vegan, and which is the healthiest to cook with? In theory “Scoby” can be kept alive indefinitely, although in practice this is determined by the use, with most kombucha “Scoby” for example, only being kept for a few months, if that. kombucha’s origins are as murky as the drink’s culture. A common tale involves its originating back to around 220BCE China, where it was known as the “elixir of life”, the “remedy for immortality” or “divine tea”, it is also credited to Japan, as well as Russia and Ukraine. View this post on Instagram A post shared by Feira Vida Liberta (@vidaliberta) on Aug 8, 2020 at 7:15am PDT Despite the disputed origins, all tales agree, that this fermented drink is good for you, with numerous purported health benefits. Want more stories like this? Sign up here . Follow STYLE on Facebook , Instagram , YouTube and Twitter .