Huy Fong Foods, the company behind Sriracha sauce, has achieved significant revenue of $150 million per year without a sales team or advertising spend. The company's success is attributed to its high-quality product and word-of-mouth marketing. The founder, David Tran, prioritizes using the best ingredients and has maintained the same distributors and wholesale pricing since the 1980s. The company's unique approach to business has led to its cult-like status and widespread popularity.