There are countless secret recipes in the world of food, from KFC’s mystery 13 herbs and spices to Coca-Cola’s closely guarded recipe, but a former McDonald’s chef has spilled the proverbial beans about the fast-food chain’s secret Big Mac sauce. Mike Haracz, who used to work as a corporate chef for McDonald’s, meaning he would help to create new menu items for the fast-food giant, now posts videos to TikTok to share his experiences and pull back the curtain on some of the restaurant chain’s secrets. Former McDonald’s chef reveals how to make the ‘secret’ Big Mac sauceIn one viral video, which…